WEBVTT

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<v Speaker 1>Welcome to Bedtime Astronomy. Explore the wonders of the cosmos

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<v Speaker 1>with our soothing Bedtime Astronomy podcast. Each episode offers a

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<v Speaker 1>gentle journey through the stars, planets, and beyond, perfect for

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<v Speaker 1>unwinding after a long day. Let's travel through the mysteries

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<v Speaker 1>of the universe as you drift off into a peaceful

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<v Speaker 1>slumber under the night sky. Could life thrive beneath Mars ice?

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<v Speaker 1>New study explores the possibility. Despite decades of exploration, no

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<v Speaker 1>direct evidence of life on Mars has ever been found. However,

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<v Speaker 1>a new study from NASA offers an intriguing possibility. Microbes

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<v Speaker 1>could potentially survive beneath the surface in pockets of meltwater

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<v Speaker 1>hidden under Martian ice. This study, published in Communication Patients,

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<v Speaker 1>Earth and Environment, suggests that sunlight penetrating through the surface

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<v Speaker 1>ice on Mars may create environments where photosynthesis can occur,

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<v Speaker 1>much like what happens in frozen environments on Earth. Water

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<v Speaker 1>is essential for life as we know it, and on Mars,

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<v Speaker 1>most of the water that still exists today is in

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<v Speaker 1>the form of ice. Mars is known for its polar

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<v Speaker 1>ice caps, but recent studies have identified large amounts of

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<v Speaker 1>frozen water even in the planet's mid latitudes, trapped just

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<v Speaker 1>beneath the surface in frozen layers mixed with dust. This

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<v Speaker 1>ancient ice, which likely formed during past Martian ice ages,

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<v Speaker 1>could hold clues about whether life might have been able

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<v Speaker 1>to survive on Mars or might still exist there today.

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<v Speaker 1>The new NASA study, led by a Diffier Color from

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<v Speaker 1>the Jet Propulsion Laboratory in southern California, uses advanced computer

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<v Speaker 1>models to simulate how sunlight interacts with Martian ice. The

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<v Speaker 1>team's findings suggest that enough sunlight can penetrate through the

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<v Speaker 1>dust laden ice on Mars to support photosynthesis even at

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<v Speaker 1>depths of up to nine feet three meters beneath the surface.

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<v Speaker 1>B shallow pools of meltwater could provide the right conditions

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<v Speaker 1>for microbial life similar to environments found in Earth's glaciers

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<v Speaker 1>and ice sheets, or microorganisms such as algae and cyanobacteria

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<v Speaker 1>thrive in tiny pockets of water within the ice. If

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<v Speaker 1>we're searching for life anywhere in the universe today, Martian

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<v Speaker 1>ice exposures are probably one of the most accessible places

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<v Speaker 1>we should be looking, said Color, the lead author of

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<v Speaker 1>the study. Two types of ice, frozen water and frozen

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<v Speaker 1>carbon dioxide, also known as dry ice. For this study,

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<v Speaker 1>Color and his colleagues focused on water ice, as it

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<v Speaker 1>is more conducive to life. This ice is believed to

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<v Speaker 1>have formed from ancient snowfalls, which were mixed with Martian

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<v Speaker 1>dust and accumulated on the surface during ice ages in

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<v Speaker 1>the planet's history. Over time, the snow compacted and solidified

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<v Speaker 1>into ice, still carrying within it the dust particles that

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<v Speaker 1>initially fell from the Martian sky. These dust particles are

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<v Speaker 1>key to the study's findings. While dust can block sunlight

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<v Speaker 1>and deeper layers of ice near the surface, it plays

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<v Speaker 1>a crucial role in generating heat. Dust absorbs more sunlight

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<v Speaker 1>than the surrounding ice, causing localized warming that can melt

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<v Speaker 1>the ice just below the surface. In certain areas, this

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<v Speaker 1>could lead to the formation of meltwater pools, potentially creating

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<v Speaker 1>habitats where life could exist shielded from the harsh conditions

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<v Speaker 1>on the surface. This process is common on Earth, explained

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<v Speaker 1>Phil christens In of Arizona State University, one of the

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<v Speaker 1>study's co authors. On Earth, similar environments can be found

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<v Speaker 1>in cryoconite holes, small meltwater pools within glaciers that are

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<v Speaker 1>formed by dust particles absorbing sunlight. These pockets of water

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<v Speaker 1>provide a habitat for a wide variety of microorganisms, including

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<v Speaker 1>photosynthetic algae and cyanobacteria. The surface of Mars is a

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<v Speaker 1>hostile place for life. The planet has a thin atmosphere

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<v Speaker 1>composed mostly of carbon dioxide, which offers little protection from

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<v Speaker 1>harmful solar and cosmic radiation. The lack of a magnetic field,

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<v Speaker 1>which on Earth shields us from the Sun's charged particles,

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<v Speaker 1>leaves the Martian surface exposed to these dangerous rays. Furthermore,

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<v Speaker 1>the atmosphere is so thin that any surface water would

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<v Speaker 1>quickly evaporate or, more likely, supplement turned directly from ice

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<v Speaker 1>into vapor without passing through a liquid phase. However, beneath

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<v Speaker 1>the surface, these harsh conditions are less extreme. Ice layers

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<v Speaker 1>just a few feet below the surface could provide enough

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<v Speaker 1>insulation to protect meltwater pools from freezing solid or evaporating,

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<v Speaker 1>while also blocking harmful radiation. This makes these pockets of

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<v Speaker 1>water a potential haven for life. Even though mars atmosphere

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<v Speaker 1>is too thin for surface water to persist, subsurface ice

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<v Speaker 1>provides a protective environment where water might remain liquid for

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<v Speaker 1>extended periods. Especially if one by dust particles within the ice,

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<v Speaker 1>explain Christensin. This insulation, combined with sunlight filtering through the surface,

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<v Speaker 1>could create the right conditions for life to survive or

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<v Speaker 1>even thrive in these subsurface pockets. The idea that life

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<v Speaker 1>could exist in these Martian meltwater pools is based on

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<v Speaker 1>the assumption that photosynthesis, a process used by plants, algae,

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<v Speaker 1>and some bacterion Earth, could occur on Mars under the

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<v Speaker 1>right conditions. Photosynthesis requires sunlight, water, and carbon dioxide, all

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<v Speaker 1>of which are present on Mars, albeit in different forms

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<v Speaker 1>than on Earth. On Earth, microorganisms like cyanobacteria use photosynthesis

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<v Speaker 1>to convert sunlight into energy, releasing oxygen in the process.

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<v Speaker 1>These organisms are found in some of the most extreme

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<v Speaker 1>environments on our planet, including the ice covered lakes of

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<v Speaker 1>Antarctica and the high altitude glaciers of the Andes. In

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<v Speaker 1>these environments, sunlight is able to penetrate the ice, providing

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<v Speaker 1>the energy needed for photosynthesis even in the near freezing water.

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<v Speaker 1>BANASA study suggests that a similar process could occur on Mars.

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<v Speaker 1>The team's models show that sunlight could penetrate up to

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<v Speaker 1>nine feet below the Martian surface, reaching potential pockets of

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<v Speaker 1>melt water and providing the energy needed for photosynthesis. While

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<v Speaker 1>the amount of sunlight on Mars is only about half

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<v Speaker 1>that of Earth, it may still be enough to support

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<v Speaker 1>microbial life in these icy pockets. One of the key

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<v Speaker 1>factors that could allow for the formation of meltwater on

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<v Speaker 1>Mars is the presence of dust within the ice. Dust particles,

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<v Speaker 1>particularly darker ones, absorb more sunlight than the surrounding ice,

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<v Speaker 1>causing localized warming. On Earth, this phenomenon creates cryochinite holes

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<v Speaker 1>in glaciers, where dust particles sink into the ice and

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<v Speaker 1>generate small pools of melt water around them. On Mars,

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<v Speaker 1>dust mixed with ice could have a similar effect. As

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<v Speaker 1>the dust absorbs sunlight, it could warn the surrounding ice,

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<v Speaker 1>causing it to melt below the surface. This melting would

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<v Speaker 1>occur not from the top down, as we usually think

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<v Speaker 1>of ice melting, but from the inside out, creating small

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<v Speaker 1>pools of liquid water beneath the protective layer of ice.

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<v Speaker 1>This is a well documented process on Earth, said Christensen,

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<v Speaker 1>referring to the way dense size can melt from within.

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<v Speaker 1>It's like a greenhouse effect where the ice traps heat

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<v Speaker 1>and allows it to build up, creating pockets of liquid

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<v Speaker 1>water inside. The NASA study expands on previous research by

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<v Speaker 1>Christensen and others who used computer modeling to show that

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<v Speaker 1>liquid water could form within dusty snowpack on Mars. Their

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<v Speaker 1>new findings suggest that these meltwater pools could be deep

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<v Speaker 1>enough and warm enough to support photosynthetic life, at least

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<v Speaker 1>in theory. While the study provides it's an exciting new

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<v Speaker 1>perspective on the potential for life on Mars, much work

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<v Speaker 1>remains to be done. The next step, according to Color,

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<v Speaker 1>is to recreate Martian ice conditions in a laboratory setting.

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<v Speaker 1>By studying how dust and ice interact and controlled conditions,

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<v Speaker 1>scientists hope to better understand the potential for meltwater pools

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<v Speaker 1>to form and whether photosynthesis could really occur in these environments.

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<v Speaker 1>In the meantime, researchers are mapping out the most promising

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<v Speaker 1>locations on Mars where subsurface water ice might exist. These regions,

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<v Speaker 1>particularly in the Martian mid latitudes between thirty and sixty degrees,

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<v Speaker 1>are prime candidates for future exploration. Potential robotic or human

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<v Speaker 1>missions could target these areas to search for signs of life,

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<v Speaker 1>either by drilling into the ice to collect samples, or

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<v Speaker 1>by using more advanced instruments to detect water beneath the surface.

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<v Speaker 1>If there is life on Mars, we're going to find

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<v Speaker 1>it in places like this said color. We just need

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<v Speaker 1>to know where to look. As the search for life

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<v Speaker 1>on Mars continues, studies like this one are helping to

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<v Speaker 1>narrow down the possibilities and refine the strategies for future exploration.

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<v Speaker 1>While Mars may seem like a cold, barren world, beneath

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<v Speaker 1>its icy surface, there may be hidden pockets of water

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<v Speaker 1>potentially teeming with life, just waiting to be discovered. To

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<v Speaker 1>do a name m