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Speaker 1: Welcome to Astronomy Daily.

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Speaker 2: I'm Anna and I'm Avery. It's Monday, March ninth, and

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if you've been following the news this past week, the

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universe has been spectacularly busy.

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Speaker 1: We've got alien signals going missing in the cosmic static

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astronaut brains getting physically rearranged in space, a dramatic launch

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pad rescue stories straight out of a thriller, and a

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genuinely mind bending discovery about why Earth seasons work the

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way they do.

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Speaker 2: LUs we're asking one of astrobiology's most provocative questions, did

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life on Earth actually start on Mars? It's a packed episode,

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let's get into it.

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Speaker 1: Here's a thought that's going to sit with you for

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a while. What if we're not alone in the universe,

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but we've been tuning to the wrong frequency this whole time.

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Speaker 2: That's essentially what a new study from SETI is suggesting.

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Researchers Vishal Goadjar and Grace Brown have published work showing

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that stellar space weather, the kind of turbulent plasma and

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solar activity that stars constantly turn out, could physically distort

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alien radio signals before they even leave their home solar system.

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Speaker 1: So here's how SETI searches typically work. For decades, scientists

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have been scanning the sky for very tightly focused, narrow

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band radio signals, extremely specific frequencies that nothing natural in

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the universe should produce. If you detect one of those,

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the thinking goes, it's almost certainly artificial, it's almost certainly someone.

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Speaker 2: And that logic is still sound. But the new research

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highlights a gap in the reasoning. Even if an alien

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civilization sense a perfectly clean narrowband signal, their own stars,

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environment might smear it out before it escapes plasma density,

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Fluctuations in stellar winds or a burst from a coronal

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mass ejection can spread that tight signal across a much

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wider range of frequencies, reducing its strength that any single

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point below what our detectors can pick up.

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Speaker 1: The team ran simulations of the billion closest sunlike and

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red dwarf stars and found that seventy percent of stars

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would broaden a signal by more than one hurtz, thirty

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percent by more than ten herts, and if a coronal

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mass ejection happened to fire off at the moment of transmission,

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the broadening could exceed one thousand herts, making the signal

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essentially invisible to the way we currently search and Red.

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Speaker 2: Dwarf stars are the biggest culprits here, and that's particularly

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significant because red dwarfs make up about three quarters of

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all the stars in the Milky Way. A lot of

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our SETI attention has focused on those systems precisely because

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they're so common, and it turns out they may also

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be the most likely to garble any messages being sent

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from their planets.

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Speaker 1: The good news is that identifying the problem is the

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first step to solving it. The team says this gives

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us a framework for redesigning searches to remain sensitive even

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one signals are broadened to look for what actually arrives

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at Earth rather than what was originally transmitted.

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Speaker 2: It's a bit like realizing you've been trying to tune

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into a radio spation, but the signal had passed through

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a foggy atmosphere on its way to you. It's not

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that the station isn't broadcasting, it's that we need a

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better aerial and that's.

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Speaker 1: A much more hopeful framing than nobody's out there. The

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universe might be full of voices, we just haven't learned

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to hear yet.

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Speaker 2: Now, if you're planning a trip to space, or if

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you're just a big Artemis fan, this next story is

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worth paying attention to, though we want to say upfront

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that it's fascinating rather than alarming.

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Speaker 1: A new study published in the Proceedings of the National

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Academy of Sciences has found that spaceflight doesn't just change

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your perspective on life, it literally shifts the physical position

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of your brain inside your skull.

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Speaker 2: A team led by Rachel Seidler at the University of

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Florida analyzed MRI scans from twenty six astronauts taken before

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and after missions to the ISS missions ranging from a

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few weeks to over a year, to measure the brain's

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actual movement. They aligned each person's skull across the two

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scans so they could track the brain's position relative to

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the bone itself.

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Speaker 1: And what they found was striking. The brain shifts upward

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and backward inside the skull. It also physically deforms, stretching

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and compressing in different directions. The sensory and motor regions

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show the largest shifts, and crucially, the longer someone spent

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in space, the more pronounced these changes were.

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Speaker 2: The underlying cause is what you'd expect from microgravity on Earth.

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Gravity constantly pulls fluids, including the cerebral spinal fluid surrounding

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your brain, downward. In space, that force disappears fluid redistributes

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towards the head. The brain effectively floats in the skull,

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and it responds to different forces from surrounding tissues.

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Speaker 1: Previous research already knew the brain shifts upward in space.

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What makes this study important is the level of detail.

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Instead of treating the brain as one object, the team

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divided it into more than one hundred regions and tracked

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each individually. That revealed patterns like opposing lateral shifts on

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each side of the brain that had been canceling each

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other out and going unnoticed in whole brain averages.

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Speaker 2: The reassuring news most of the changes recover within six

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months of returning to Earth, and the astronauts themselves didn't

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report symptoms like headaches or cognitive fog. The researcher stressed

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that this doesn't mean people shouldn't go to space, but

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as missions get longer and as Artemis starts taking humans

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back to the Moon and eventually towards Mars, understanding these

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effects will be important for designing proper countermeasures.

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Speaker 1: It's a reminder that space is a genuinely alien environment

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for the human body. We evolved under one gravity, and

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every time we leave it, we're running an experiment on ourselves.

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The more we understand those experiments, the safer we can

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make long duration spaceflight.

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Speaker 2: Now for a story that is, in the best possible way,

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a bit of a thriller. In November last year, something

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went wrong at the historic bikan Or Cosmodrome in Kazakhstan,

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and nobody was entirely sure it could be fixed in time.

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Speaker 1: It started. On November twenty seventh, twenty twenty five, a

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Soyuz rocket lifted off from launch Site thirty one, carrying

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the Soyuz MS twenty eight spacecraft, with two Rose Cosmos

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cosmonauts and NASA astronaut Christopher Williams aboard. The launch was successful.

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The crew docked with the ISS without incident.

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Speaker 2: But post launch inspection footage revealed significant damage to the

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pad itself. A component called the service cabin, which retracts

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into a protective cavity to shield it from engine exhausting ascent,

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hadn't been properly secured. The powerful rocket exhaust dislodged it

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and the structure fell several meters into the launch trench,

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deforming bridges, access walkways and other critical infrastructure.

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Speaker 1: The space community was skeptical this could be fixed quickly.

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These are heavy, complex structures, but Rose Cosmos committed to

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the repair, and it turns out their long history with

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the soyuse system gave them an unexpected advantage. Bear service

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cabins had been sitting in storage leftover from refurbishment plans

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dating back to the nineteen seventies.

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Speaker 2: The restoration effort was enormous. Over one hundred and fifty

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personnel worked on the project. They completed over two hundred

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and fifty meters of welding, painted nearly twenty four hundred

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square meters of structures, replaced all fastening units, and fully

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updated the electrical systems. The replacement cabin, originally built for

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an older SOYZ variant, needed modifications to work with modern hardware.

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Speaker 1: And in under two months from the initial damage assessment,

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far faster than most observers anticipated, Rose Cosmos announced the

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pad was fully restored and declared ready for operations.

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Speaker 2: That means progress MS thirty three and uncrewed cargo ship

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is now cleared to launch from Site thirty one on

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March twenty second. It will deliver around two point five

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tons of supplies to the ISA propellants, water, food, scientific equipment,

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and crew parcels.

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Speaker 1: It's a genuinely impressive piece of engineering under pressure, and

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it's a good reminder that behind every rocket launch is

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an enormous amount of groundwork literally in this case, that

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never makes headlines until something goes sideways.

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Speaker 2: Okay, pop quiz. Why do we have seasons?

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Speaker 1: Earth's axial tilt. We all learned this in school. When

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the northern hemisphere is tilted toward the Sun, it's summer

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up here. When it's tilted away, it's winter.

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Speaker 2: Exactly right. And most people also know that Earth's orbit

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around the Sun is slightly elliptical. We're a bit closer

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to the Sun in January and a bit farther away

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in July. But we're usually told that effect is minor

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and it doesn't significantly change our seasons. Well, a new

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study published in Nature suggests we may have been under

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selling that distance effect quite significantly.

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Speaker 1: The research, led by John Chiang at UC Berkeley, focuses

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on a specific feature of the Pacific Ocean called the

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cold Tongue, a strip of cooler water that stretches westward

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from South America along the equator. This cold tongue is

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closely tied to Almino and La a Ninia cycles, which

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influence rainfall, drought, and weather patterns across huge swaths of

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the planet.

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Speaker 2: What Chang and his colleagues found is that the changing

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Earth sun distance creates its own separate annual cycle in

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the cold tongue, distinct from the tilt driven one, and

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the two cycles are slightly out of sync. The distance

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based one runs about twenty five minutes longer than the

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tilt based one. That doesn't sound like much, but it

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means that over about eleven thousand years, the two effects

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drift from being perfectly in phase to perfectly out of phase.

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Speaker 1: When they're in phase like they are roughly today, the

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effects reinforce each other. When they're out of phase, as

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they were around six thousand years ago, they partially cancel,

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producing a much weaker seasonal cycle in the cold tongue.

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And since the cold tongue drives el Nino, that means

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el Nino patterns themselves would have been dramatically different in

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the deep past.

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Speaker 2: The mechanism works in a counterintuitive direction too. While axial

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tilt creates north south temperature differences, the distance effect creates

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an east west contrast between the continental hemisphere of the

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America's Africa and Eurasia and the ocean dominated Pacific side.

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That contrast drives trade winds, which in turn shape the

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cold tongue.

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Speaker 1: It's worth noting the study is entirely model based. It's

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a prediction that will need observational verification, but it opens

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fascinating questions for paleoclimate science. If Earth's orbital shape was

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changing the cold tongue over twenty two thousand year cycles,

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some ancient climate records may need reinterpretation.

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Speaker 2: And there's something wonderfully humbling about it. We've been telling

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school children for generations exactly why seasons have happen, and

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it turns out the full picture involves a subtle cosmic

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clockwork we hadn't fully accounted for.

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Speaker 1: And now for our final story today and honestly, one

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of the most mind bending things you can contemplate on

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a Monday, what if you're not from Earth?

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Speaker 2: In a very literal biological sense.

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Speaker 1: Possibly a new study is revisiting the concept of panspermia,

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the idea that life doesn't necessarily originate independently on each planet,

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but can travel between worlds and the vehicle asteroid impacts.

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Speaker 2: Here's the premis. We know that when a large asteroid

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or comet slams into a planet within a force, it

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can blast material into space, rocks, dust, and potentially anything

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living inside those rocks. We've actually found meteorites on Earth

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that originated on Mars, blasted off by ancient impacts, so

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the physical pathway definitely exists.

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Speaker 1: The question has always been could anything survive that journey?

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You're talking about the ejection itself, an enormous shockwave, then

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exposure to the vacuum and radiation of space for potentially

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millions of years, then a fiery atmospheric entry and high

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speed impact at the destination.

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Speaker 2: The new research suggests the answer might be yes. Under

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the right conditions, some microbes, particularly those that form hardy

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spores or live deep within rocks, could potentially survive all

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of those stages. The rock itself provides shielding from radiation

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during transit, and the numbers game matters. Even if only

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a tiny fraction of ejected material survives, the sheer volume

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of material blasted around the early Solar system means some

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viable biology could have made the crossing.

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Speaker 1: The Mars connection is particularly intriguing. Early Mars was, by

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many accounts a better candidate for life to emerge first

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than early Earth. It cooled faster, it had liquid water earlier,

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and it had a gentler gravitational well, making it easier

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for material to escape. If life arose on Mars billions

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of years ago and hitched a ride on an impact

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ejected rock, Earth could effectively have been seated.

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Speaker 2: Which would mean that if we ever find microbial life

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on Mars or evidence of ancient life there, we'd face

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a fascinating interpretive challenge. Did life arise independently on both

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worlds or are we all in some deep ancestral sense Martians.

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Speaker 1: The study emphasizes this is still highly speculative, hence bermia

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remains a hypothesis rather than established science, But as our

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ability to study Martian samples improves, especially with future sample

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return missions, we may eventually be in a position to

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test it directly.

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Speaker 2: Either way, the question is deeply fascinating, and it gives

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a whole new flavor to the phrase out of this world.

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Speaker 1: That's Astronomy Daily from Monday, March ninth. From scrambled alien

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signals to astronaut brains, from a launchpad resurrection, to the

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hidden clockwork of Earth seasons and the possibility that we're

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all secretly from Mars.

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Speaker 2: It's been a great episode. If you're enjoying the show,

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please leave us a review. Wherever you listen. It genuinely

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helps new listeners find us and share an episode with

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a friend who's curious about the universe.

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Speaker 1: You can find us at Astronomydaily dot io and we're

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at astro Daily pod on x, Instagram, TikTok, YouTube, and Tumbler.

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Speaker 2: We'll be back tomorrow with more of the Universe's greatest hits.

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Until then, keep looking up.

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Speaker 1: Bye for now, Sunday.

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Speaker 2: Starsz. Starz