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Speaker 1: Welcome to the deep dive, where we plunge into the

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heart of what we truly know and maybe more importantly,

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what we really don't. For so much of our lives,

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you know, we're kind of taught to find answers. We

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go to school, we read, we research, assuming that for

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every question there's a solid answer out there, someone somewhere

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must have.

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Speaker 2: It figured out right, that's the assumption.

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Speaker 1: But what if the most profound, the most exciting questions

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are the ones where humanity collectively just doesn't have a clue.

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Speaker 2: It's an electrifying thought, isn't it. Our mission today isn't

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just about laying out facts we do know. Instead, we're diving,

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you know, headfirst into the truly unknown, these questions that well,

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no matter how far we push science, they just remain

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stubbornly beyond our grasp. It's an exploration into the grandest

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mysteries that still.

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Speaker 1: Confound us absolutely. I remember as a kid, I'd been

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hours thinking about things like what does it actually feel

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like to be a dog?

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Speaker 2: Yeah?

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Speaker 1: You know yeah? Or to fish feel pain? Even bigger

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stuff like was the Big Bang just an accident? Or

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is there a god? The big ones really big ones? Yeah?

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And I genuinely thought some adult, a scientist, someone must know,

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and then you realize, Nope, no one knows.

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Speaker 2: That's a key moment, isn't it.

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Speaker 1: It really is. And honestly, for many of those questions,

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they puzzle me even more now. But that's the exciting part.

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I think grappling with these questions it means you're standing

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right at the frontier of human understanding and you just

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never know what, like mind bending possibilities, you'll stumble upon there.

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Speaker 2: And that's precisely what we're going to do in this

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deep dive. We're going to tackle two specific, incredibly profound questions,

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questions that currently stump even the well the brightest mount

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on Earth. Okay, we'll explore the multitude of theories, the

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confusing possibilities, and why these questions push us right to

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the very limits of our comprehension.

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Speaker 1: This is about stepping into the vast unknown of existence itself.

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Pretty much, Yeah, all rights. Unpack this Our first question,

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one that really takes us to the edge of what

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we think is real. How many universes are there?

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Speaker 2: Whoa starting big.

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Speaker 1: Starting very big. To even begin to grasp this, we

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have to talk about scale, think about the Sun huge, right,

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big enough to fit a million earths inside it hard

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to even picture exactly. Yet, even that giant star is

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just a tiny pimprick in our Milky Way galaxy. Our

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galaxy holds something like four hundred billion.

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Speaker 2: Stars, four hundred billion.

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Speaker 1: You can even see a hint of it on a

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clear night, that sort of pale milky band across the sky.

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It's humbling just thinking about its size.

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Speaker 2: And if you think the Milky Way is vast, well

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it gets even more astonishing. Our best telescopes can detect

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maybe one hundred billion other galaxies beyond our own.

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Speaker 1: One hundred billion galaxies.

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Speaker 2: Yeah, to try and put that into perspective, imagine each

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star was just a single grain of sand. Okay, the

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stars in our Milky Way galaxy alone, that would be

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enough sand to fill a beach, say thirty feet by

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thirty feet and three feet deep.

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Speaker 1: Wow, that's a lot.

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Speaker 2: Of sand it is. And now get this, all the

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booches on Earth combined wouldn't have enough sand to represent

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all the stars in just the observable universe.

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Speaker 1: Okay, that's really hard to wrap your head around.

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Speaker 2: The sheer scale is truly unfathomable. It stretches so far

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beyond our everyday experience.

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Speaker 1: Wow, Okay, an incredible number of stars. Yeah, it really

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does stretch the imagination. But what if even that vastness,

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that observable universe, is just a tiny fraction of the

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whole picture. M what are physicists suggesting might lie beyond

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what we can actually see?

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Speaker 2: Well, that's where it gets really interesting and maybe a

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bit weird.

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Speaker 1: Uh.

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Speaker 2: Oh, well, our physical reality here on Earth is definitely

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connected to those distant invisible galaxies. They're all part of

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our single giant universe, right, same physical laws, same kinds

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of atom.

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Speaker 1: Right, one big system exactly.

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Speaker 2: But recent theories in physics, well they're telling us there

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could be countless of universes entirely.

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Speaker 1: By other universes. Okay.

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Speaker 2: One of the leading ideas, string theory, suggests these other

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universes might be built on totally different types of particles,

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have different properties, obey entirely different physical laws.

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Speaker 1: So completely alien realities.

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Speaker 2: Pretty much. Most of them probably couldn't even support life

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as we know it. Maybe they flash in and out

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of existence in a nanosecond, and they might exist and

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get this up to eleven dimensions, eleven demandons. Yeah, where

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these extra dimensions are like incredibly tiny and curled up.

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That allows for all the different ways these fundamental strings

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can vibrate, which basically creates the different universes with different properties.

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Speaker 1: So we're talking about wonders beyond our wildest imagination here,

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and string theory doesn't just say there might be other universes.

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Speaker 2: Now, the leading version actually predicts a multiverse.

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Speaker 1: A multiverse made up of what was that number.

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Speaker 2: Ten to the five hundredth power universes, ten.

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Speaker 1: To the five minuits. That's one followed by five hundred zeros. Yep, Okay,

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how do you even visualize that? That sand analogy earlier

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was already.

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Speaker 2: Mind blowing, right, it's almost impossible. Imagine if every single

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grain of sand on every beach on Earth represented a

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whole universe, you'd still be astronomically short, like, not even close.

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Speaker 1: So ten to the five hundredth power is it's basically incomprehensible.

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It makes our entire observable universe seem like a single speck.

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Speaker 2: Of dust in a potentially infinite library. Yeah, it really

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is beyond comprehension.

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Speaker 1: And yet even that number ten to the five hundred,

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which sounds almost infinite. It's tiny compared to actual infinity.

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Speaker 2: Right exactly. Some physicists actually believe the space time continuum

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is literally infinite, genuinely genuinely infinite, and within that infinite

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expanse there could be an infinite number of what they

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call pocket universes, each one potentially having different properties. Your

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brain doing okay with that?

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Speaker 1: My brain is definitely stretched. It makes you wonder about

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every choice you ever made, doesn't it if there's an

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infinite me out there? Yeah, who chose differently? I mean,

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what does that even mean for free will or anything?

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Speaker 2: It raises huge philosophical questions, it really does.

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Speaker 1: It's almost, I don't know, comforting in a weird way

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to realize how much we just don't know. It feels

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like we're only just scratching the surface of reality.

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Speaker 2: Absolutely.

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Speaker 1: And then, just to make things even more complicated, there's

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quantum theory.

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Speaker 2: Ah, yes, the physics of the very small.

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Speaker 1: Right, which tells us particles can be in multiple places

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at once or linked instantly across vast distances. Stuff that

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just sounds impossible.

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Speaker 2: The theory itself works perfectly. It makes predictions we can

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test and verify. It's undeniably successful.

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Speaker 1: But interpreting what it means.

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Speaker 2: Ah, that's the baffling part. What does it actually mean

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for our reality? Yeah, and some physicists argue, you can

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only really make sense of quantum mechanics if you imagine

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that huge numbers of parallel universes are being spawned constantly,

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every single.

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Speaker 1: Moment, spawning universes. Ye, like right now?

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Speaker 2: According to this interpretation, Yes, many of these universes, they suggest,

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would be very much like ours, and would even include multiple.

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Speaker 1: Copies of you, multiple copies of me.

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Speaker 2: Yeah. Imagine in one universe you graduated with honors, married

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your dream person. Okay, in another, well, maybe things didn't

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go quite so well. Different choices, different outcomes.

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Speaker 1: Is quite a thought. It really puts your own life

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in perspective.

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Speaker 2: It does raises big questions about choice, destiny, you name it.

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Speaker 1: Now. I can imagine someone listening might be thinking, Okay,

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this sounds like pure science fiction. Come on, there's only

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one universe.

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Speaker 2: And that's a perfectly reasonable reaction.

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Speaker 1: You wouldn't be alone in thinking that. Some scientists still

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firmly hold that view. They insist the only meaningful answer

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to how many universes is one period.

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Speaker 2: It's a strong counter argument based on what we can

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currently observe and test.

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Speaker 1: And then, just to add another layer of complexity, you've

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got some philosophers, some mystics who might even argue that

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our universe, the one we experience, is itself just an illusion, right.

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Speaker 2: The whole reality isn't realpec So where does that leave us.

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Speaker 1: We've got one, we've got ten to the five hundred,

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we've got infinity, we've got maybe zero if it's all

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an illusion.

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Speaker 2: What's fascinating and maybe a bit frustrating is that there's

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absolutely no consensus on this right now, not even close.

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Speaker 1: Really, no clear front runner, Nope.

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Speaker 2: All we can really say for sure based on current

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physics and theory is that the answer seems to lie

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somewhere between zero and infinity.

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Speaker 1: Between zero and infinity, that's a pretty wide range.

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Speaker 2: Just a bit.

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Speaker 1: So what does this profound uncertainty about our universe or

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universes truly mean for us? It feels like more than

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just a numbers game.

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Speaker 2: Oh, absolutely, It challenges our most basic assumptions about reality,

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about our place and the cosmos. Ye, it forces us

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to maybe redefine what knowing something really means. It pushes

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us towards perhaps the biggest paradigm shift in knowledge humanity

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has ever seen.

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Speaker 1: Where humility might be just as important as discovery.

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Speaker 2: Precisely, it's realizing the vastness of our own ignorance.

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Speaker 1: In a way, it's a truly thrilling time, though, isn't

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it to be alive pondering these questions? Standing right at

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this boundary of human understanding?

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Speaker 2: It really is pretty cool time to be studying physics

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or just thinking about these things.

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Speaker 1: Okay, the sheer scale and the well potential multiplicity of

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universes we've just talked about is truly humbling, mind bending even,

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But that immensity, that staggering number of possible worlds out there,

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it only makes our next big question even more pressing.

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Oh yes, a question that's captivated people for decades now,

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Why can't we see any evidence of alien life?

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Speaker 2: That big one? Where is everybody?

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Speaker 1: Exactly? If the cosmos is so vast, potentially so full

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of worlds, where are they?

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Speaker 2: This is the famous Fermi paradox, right, named after the

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physicist Enrico Fermi, who supposedly asked it back in nineteen

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fifty during a lunch conversation.

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Speaker 1: Right, and look, some people claim UFOs are visiting all

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the time. Governments are covering it up.

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Speaker 2: Yeah, those theories are out there, but frankly, when you

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look for solid scientific evidence, they're just not very convincing.

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Speaker 1: Agreed, So that lives us with this profound riddle. We

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have recent data, like from the Kepler space telescope suggesting

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there could be what half a trillion planets just in

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our Milky Way.

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Speaker 2: Half a trillion an enormous number. And if even a

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tiny fraction of those, a one in ten thousand has

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conditions that might support life, which seems plausible, that's still

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fifty million potentially life harboring planets right here in our

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own galactic backyard.

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Speaker 1: Fifty million. That number is just astounding. And here's the kicker.

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Isn't it our Earth? Our Solar system? It didn't even

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form until about nine billion years.

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Speaker 2: After the Big Bank, relatively late to the party.

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Speaker 1: Yeah, which means countless other planets in our galaxy should

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have formed much much.

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Speaker 2: Earlier, billions or at least many millions of years before

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Earth even existed, giving life a huge head start elsewhere.

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Speaker 1: Exactly, So, if just a few of those planets spawned

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intelligent life, and that life developed.

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Speaker 2: Technology, those technologies would have add millions, maybe billions of

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years to grow in complexity and power. Think about it.

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We've seen how dramatically technology can accelerate in just one

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hundred years.

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Speaker 1: Here on Earth, right from horse drawn carts to smartphones

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in a blink, cosmically speaking.

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Speaker 2: Exactly, So imagine what an intelligent alien civilization could achieve

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in millions of years. They could have spread across the galaxy,

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built giant energy harvesting structures.

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Speaker 3: Around stars like Dyson'sphares potentially yeah, or launched fleets of

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colonizing spaceships, or maybe created glorious works of art that

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fill the night sky, things we couldn't possibly miss.

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Speaker 1: Or at the very least, you'd think we'd pick up

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some kind of signal, right, electromagnetic signals, maybe leaking unintentionally

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or maybe sent deliberately.

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Speaker 2: You would absolutely think so. And yet we see no

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convincing evidence, none of it. Why the great silence is

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it's sometimes called it's truly puzzling.

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Speaker 1: And when you start thinking about possible answers, well, some

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of them get pretty dark, don't they.

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Speaker 2: They can, Yes, the implications are quite profound, Like.

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Speaker 1: What if what if a single super intelligent civilization already

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took over the galaxy ages ago, and now they're just

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out there enforcing radio silence, maybe eliminating any potential competitors

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that get too noisy or advanced.

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Speaker 2: The dark forest hypothesis essentially a scary thought, just sitting there, monitoring,

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ready to obliterate anything that looks like a threat.

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Speaker 1: Chilling. Or maybe the evolution of intelligent technology creating life

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is just far far rarer than we assume. I mean,

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think about it, only happened once here on Earth in

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four billion years of life. Maybe that was the incredible fluke.

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Maybe we are, in fact the first such civilization in

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our galaxy.

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Speaker 2: The rare Earth idea that were genuinely unique or at

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least exceptionally early, or another dark one. Yeah.

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Speaker 1: Perhaps civilizations inegiably carry the seeds of their own destruction.

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Speaker 2: Ah, the self destruction filter.

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Speaker 1: Yeah, maybe they can't control the very technologies they create,

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you know, RUNAWAYI or catastrophic climate change from energy use,

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or maybe just blowing themselves up with advanced weapons.

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Speaker 2: So bring thought that intelligence might have a built in

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self destruct button. That the silence is the sound of

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failed civilizations.

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Speaker 1: Yeah, those are definitely chilling possibilities to consider makes you

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look at our own situation a bit differently.

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Speaker 2: But it's not all doom and gloom. There are also

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numerous more hopeful explanations for the silence.

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Speaker 1: Okay, good, let's hear some of those.

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Speaker 2: Well, first start, maybe we're just not looking that.

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Speaker 4: Hard really with all our telescope relatively speaking, Yeah, we're

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spending honestly a pitiful amount of money on the dedicated

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search for extraterrestrial intelligence.

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Speaker 2: For SETI, only a tiny fraction of stars have ever

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been closely examined for signals.

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Speaker 1: Okay, that's a fair point. We haven't exactly scanned the

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whole sky.

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Speaker 2: Not even close, and it's entirely possible we're not looking

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the right way. Perhaps as civilizations get really advanced, they

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quickly discover communication methods far more sophistic then radio waves.

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Speaker 1: Like what who knows?

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Speaker 2: Maybe all the real interstellar communication happens using something we

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barely understand, like manipulating dark matter or dark energy.

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Speaker 1: Whoa communicating through dark energy?

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Speaker 2: It sounds wild, I know, but these things make up

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most of the universe's mass and energy. Maybe that's where

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the advanced civilizations are operating, and we're just tuned to

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the wrong channel effectively.

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Speaker 1: That's a fascinating thought, though, I mean, dark matter and

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dark energy are already concepts right at the edge of

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our understanding.

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Speaker 2: Oh absolutely.

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Speaker 1: How plausible is it that aliens could actually use them

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to communicate, or even that they'd choose to wouldn't like

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regular radio waves be more universal?

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Speaker 2: That's a very valid point. It definitely pushes the boundaries

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of speculation, but it highlights the possibility that we might

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be looking for I don't know, an iPhone signal using

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a telegraph machine. Our methods might be primitive by galactic standards.

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Speaker 1: Okay, fair enough.

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Speaker 2: What else, Well, maybe we're looking at the wrong scale,

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entirely scale. So perhaps really advanced civilizations eventually realize that

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life at its core is just complex patterns of information

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interacting information, And maybe they figure out that this complexity,

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this interaction can happen far more efficiently with less environmental

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impact at a very small scale.

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Speaker 1: Smaller is better.

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Speaker 2: Think about our own technology. Our clunky, old stereo systems

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shrink down to tiny iPods, right, Our computers went from

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room size to fitting in our pockets.

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Speaker 1: Yeah, that's true.

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Speaker 2: Maybe intelligent life itself follows that trend. Maybe to reduce

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their footprint or increase efficiency. Advanced aliens have turned microscopic

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microscopic aliens, So our own solar system could be absolutely

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teeming with incredibly complex, intelligent alien life and we're just

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not noticing them because we're looking for big spaceships and

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radio signals.

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Speaker 1: Wow, that's unexpected. Aliens under our noses.

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Speaker 2: Potentially, potentially, And here is a truly wild thought, just

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to really stretch your mind. Oh boy, go on, what

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if the very ideas in our heads, What if they

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are a form of alien.

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Speaker 1: Life, ideas as in thoughts?

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Speaker 2: Well, think about it. It sounds outlandish, but ideas do

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seem to have a life of their own, don't they.

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They spread, they evolve, they compete, They can certainly outlive

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their creators.

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Speaker 1: Hmm, like memes, but on a grander scale.

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Speaker 2: Exactly, Maybe biological life like us is just a passing phase,

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a temporary vessel, and information itself, pure thought is the ultimate,

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most durable form of existence in the universe.

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Speaker 1: Okay, that is a wild thought that concepts themselves could

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be the aliens. It definitely sticks with you.

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Speaker 2: It's out there, but it's one of the many possibilities

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people have considered when faced with the silence.

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Speaker 1: So given all this, what's next? Where do we go

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from here in the search for alien life.

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Speaker 2: Well, things are actually getting quite exciting on that front.

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Within the next say, fifteen years or so, we should

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start getting real spectroscopic data from promising nearby exoplanet.

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Speaker 1: Spectroscopic data, so analyzing the light coming from their atmosphere exactly.

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Speaker 2: That data could vie the composition of their atmospheres, telling

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us if they have oxygen, water, vapor, methane signs that

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they might actually be habitable or even inhabited.

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Speaker 1: That would be huge, Yeah, actual chemical signatures of life

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from another world.

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Speaker 2: It would be revolutionary. And groups like SETI, the Search

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for Extraterrestrial Intelligence, they're now releasing vast amounts of their

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observational data to the public. Oh really, Yeah, inviting millions

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of citizen scientists, maybe even you listening right now, to

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help sift through it all using their own computers, bringing

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the power of the crowd to this grand quest.

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Speaker 1: That's fantastic, harnessing collective brain power.

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Speaker 2: And right here on Earth there are some amazing experiments

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happening trying to create life from scratch in the lab.

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Speaker 1: Create life, yeah, like artificial life.

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Speaker 2: Yeah, life that might be very different from the DNA

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based forms we know. Understanding how life can arise in

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whatever form will deepen our understanding of what life fundamentally is.

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Speaker 1: Which would help us know what to look for out there.

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Speaker 2: Precisely. This will help us chip away at that ultimate question,

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is the universe teeming with life? Or are we, against

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all odds, truly alone?

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Speaker 1: And you know either answer, it's just staggering to contemplate,

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Isn't it.

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Speaker 2: Absolutely on inspiring either way.

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Speaker 1: Because even if we are alone, the very fact that

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we exist, that matter on this small planet somehow organized

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itself into beings that can think and dream and ask

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these monumental questions about the cosmos, Well, that might just

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turn out to be one of the most important, most

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incredible facts about the entire universe.

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Speaker 2: It really puts our own existence into a profound context.

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The quest for knowledge, for understanding. It never gets dull,

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does it.

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Speaker 1: No, it's actually the opposite. I find the more you learn,

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the more amazing and mysterious the world seems.

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Speaker 2: Couldn't agree more.

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Speaker 1: And it's those crazy possibilities, those huge unanswered questions, the

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ones that take us right to the very edge of

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what we can even conceive those are the things that

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really pull us forward, I think. Yeah, So stay curious,

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keep pondering these things, because the biggest mysteries are often

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the most profound, and who knows what answers might be

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just around the corner.