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From Stellar Winds to Martian Caves - Your Daily Space Update · Space News Today

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  Welcome to Astronomy Daily, the podcast
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  [music] that brings you the universe,
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  one story at a time. I'm Avery.
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  >> And I'm Anna. It's great to have you
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  with us. Today, we've [music] got a
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  packed episode. We'll be looking at how
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  giant stars might be spreading life's
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  building blocks in a way we never
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  expected.
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  >> We'll also dive into [music] the
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  mysterious origins of hot Jupiters,
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  check out some newly discovered caves on
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  Mars that could be hiding signs of life,
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  [music] and take a breathtaking tour of
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  the cosmos. courtesy of the James Webb
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  Space [music] Telescope.
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  >> Plus, a roundup of rocket launches this
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  week and a significant step forward for
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  Iran's space program. So, let's [music]
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  get started with our first story, which
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  could rewrite our understanding of how
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  stars seed the cosmos. [music]
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  >> I'm intrigued. What's the latest?
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  >> Well, for a long time, astronomers
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  believed that the winds from red giant
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  stars were driven by a simple mechanism.
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  The pressure of starlight pushing on
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  tiny grains of dust.
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  >> Right? Like a solar sail but on a
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  microscopic scale. This process was
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  thought to be responsible for spreading
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  heavy elements like the carbon in our
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  bodies across the galaxy.
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  >> Exactly. But a new study focusing on the
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  red giant star R Datus is challenging
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  that entire idea. After careful
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  observation, researchers found that the
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  dust grains forming around this star are
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  simply too small.
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  >> Too small. So, the push from the stars
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  light isn't strong enough to drive the
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  stellar wind out into space.
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  >> Precisely. The physics just doesn't add
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  up. This suggests other more powerful
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  forces must be at play. The study points
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  to possibilities like giant convective
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  bubbles similar to water boiling in a
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  pot or powerful stellar pulsations that
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  physically throw material outwards.
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  >> Wow. So, it's less of a gentle push and
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  more of a cosmic eruption. That's a huge
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  shift in thinking.
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  >> It is. It means we have to reconsider
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  one of the fundamental processes of how
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  galaxies are enriched with the elements
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  necessary for planets and ultimately for
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  life itself.
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  >> From the end of a star's life, let's
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  jump to the formation of planets. We're
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  talking about one of the strangest types
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  of exoplanets out there, the hot
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  Jupiters.
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  >> Mhm. These are gas giants much like our
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  own Jupiter, but they orbit incredibly
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  close to their host stars, completing a
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  full year in just a few Earth days. The
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  big question has always been, how did
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  they get there?
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  >> One popular theory was called high
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  eccentricity migration. It's a pretty
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  chaotic process where a planet gets
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  knocked around by other objects in the
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  system, eventually flinging it into a
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  tight close orbit. It sounds very
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  violent, but new research looking at
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  over 500 of these hot Jupiters suggests
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  a much gentler path for many of them.
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  The study found that about 30 of these
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  worlds likely formed through a process
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  called disc migration.
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  >> Disc migration. So what does that
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  entail? Is it calmer?
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  >> Much calmer. In this scenario, the
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  planet forms much farther out in the
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  protolanetary disc, that big swirl of
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  gas and dust a star is born from, and
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  then it slowly spirals inward, migrating
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  through the disc material until it
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  settles into a close orbit. That makes
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  sense. So, it's not always a game of
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  planetary pinball. This really adds
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  another important layer to our
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  understanding of how planetary systems
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  can evolve. Now, let's bring our focus a
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  little closer to home with a quick
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  roundup of recent and upcoming rocket
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  launches. It's been a busy period as we
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  close out 2025 and head into 2026.
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  >> Absolutely. China has been particularly
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  active with two recent launches. A Chong
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  Xang 4B rocket took flight, as did a
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  Chong Xang 7A.
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  >> Meanwhile, SpaceX has been wrapping up
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  its year. A Falcon 9 mission
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  successfully deployed the CSG3 satellite
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  for the Italian Space Agency, which
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  officially marked the company's final
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  mission for 2025. Right. And they're not
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  wasting any time in the new year. The
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  very first launch scheduled for 2026 is
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  another Falcon 9. This time carrying a
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  fresh batch of Starling satellites into
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  orbit. The pace just never seems to slow
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  down.
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  >> It certainly doesn't. Sticking with our
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  solar system, we have some incredible
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  news from Mars that I'm very excited
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  about.
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  >> Oh, what's that?
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  >> Chinese researchers have identified what
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  they believe are eight potential carst
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  caves in a region called Hebris Val.
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  >> Carst caves. Okay. So, these aren't the
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  usual volcanic lava tubes we've talked
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  about before on the show.
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  >> Exactly. And that's what makes this so
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  significant. Carst caves are formed when
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  water dissolves soluble rock like
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  limestone. This is the first time this
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  specific type of cave has been
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  identified on Mars and it's a huge
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  indicator of past water activity.
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  >> Water, that's the magic word. So, this
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  is a massive deal for the search for
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  life, isn't it?
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  >> It's a potential gamecher. The surface
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  of Mars is blasted with harsh radiation
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  which would destroy any delicate signs
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  of life. But deep inside these caves,
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  ancient bio signatures could have been
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  preserved for billions of years,
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  perfectly shielded from that hostile
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  environment.
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  >> They're like natural time capsules.
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  These caves must have just shot to the
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  top of the list for places we need to
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  explore on Mars. Absolutely fascinating
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  stuff.
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  >> It really is. And from searching for
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  hidden life to just admiring the sheer
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  beauty of the universe, let's talk about
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  the James Web Space Telescope.
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  >> Right. It's hard to believe, but it
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  recently celebrated the fourth
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  anniversary of its launch.
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  >> Four years of revolutionary science. To
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  mark the occasion, the European Space
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  Agency released a spectacular video that
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  they're calling a fly through of the
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  cosmos.
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  >> I saw this and it is stunning. They've
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  taken some of web's most iconic
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  highresolution images and created these
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  incredible zoomins. You feel like you're
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  actually soaring through nebulas and
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  past distant galaxy clusters. It gives
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  you a real sense of depth and scale that
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  you don't always get from a static
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  image. They take you on this immersive
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  journey through star forming regions and
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  ancient galaxies. We'll be sure to put a
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  link in the show notes because it's
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  something you really have to see to
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  believe.
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  >> Definitely. It's a fantastic reminder of
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  just how much this incredible
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  observatory has shown us in only four
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  years. For a final story today, we turn
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  our attention back to Earth orbit.
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  >> That's right. Iran has made a
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  significant advancement in its national
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  space program. The country successfully
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  launched three of its domestically built
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  earth observation satellites.
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  >> The satellites are named PA Zafar 2 and
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  Kowsar. And what's also notable here is
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  how they got to orbit.
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  >> The launch was conducted on a Russian
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  Soyuse rocket taking off from the
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  Vistoni Cosmodrome in Russia.
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  >> This really highlights the growing space
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  collaboration between the two nations.
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  It provides Iran with reliable access to
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  orbit while Russia gains a partner in
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  various space activities.
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  >> It's a major milestone for Iran's
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  ambitions in space, allowing them to
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  gather their own data for environmental
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  monitoring, agriculture, and other
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  national applications. It's a very
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  strategic development.
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  >> And that's all the time we have for
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  today on Astronomy Daily. From the winds
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  of red giants to hidden caves on Mars,
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  the universe truly never fails to
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  surprise us.
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  >> We hope you've enjoyed the journey. You
• 7:22
  can find links to some of the things we
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  discussed, including that incredible
• 7:26
  James Webb anniversary video on our
• 7:28
  website at astronomydaily.io.
• 7:31
  We'd love it if you'd subscribe wherever
• 7:32
  you get your podcasts. Thanks so much
• 7:34
  for tuning in.
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  >> Until next time, keep looking up.
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  Astronomy [music] day.
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  Stories been told.
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  Stories [music] told.