In this episode, we embark on an exhilarating journey through the cosmos, exploring groundbreaking discoveries and developments that could reshape our understanding of the universe. We begin with a revelation about red giant stars, challenging long-held beliefs about how they spread life's essential elements across galaxies. New research on the star R Doradus suggests that powerful forces, rather than simple starlight pressure, are responsible for driving stellar winds, prompting a reconsideration of how galaxies are enriched.Next, we delve into the enigmatic world of hot Jupiters—gas giants that orbit perilously close to their stars. Recent studies indicate that many of these planets may have formed through a calmer process known as disk migration, providing insight into the evolution of planetary systems.Transitioning back to Earth, we provide a roundup of recent rocket launches, highlighting China's active role in space exploration and SpaceX's successful deployment of the CSG 3 satellite. As we shift our focus to Mars, we uncover the discovery of potential karst caves, which could harbor signs of ancient life, preserved from the planet's harsh surface conditions.We also celebrate the fourth anniversary of the James Webb Space Telescope, showcasing a stunning new video that offers an immersive tour of the cosmos, highlighting its remarkable contributions to astronomy. ( https://youtu.be/lFiOZqyymUY?si=lOCkdIoMU5aRKuIB (https://youtu.be/lFiOZqyymUY?si=lOCkdIoMU5aRKuIB) ) Finally, we report on Iran's significant advancements in its space program, with the successful launch of three domestically built Earth observation satellites, marking a strategic collaboration with Russia.Join us as we traverse these captivating stories and more in this episode of Astronomy Daily!00:00 – **This week's podcast features a look at how giant stars might spread life
00:38 – **New study could rewrite our understanding of how stars seed the cosmos
02:04 – **New research suggests 30 hot Jupiters likely formed through disk migration
03:23 – **China has been particularly active with two recent launches
04:12 – **Chinese researchers have identified eight potential karst caves on Mars
05:27 – **The James Webb Space Telescope recently celebrated its fourth anniversary
06:20 – **Iran successfully launched three of its domestically built earth observation satellites
07:11 – **This is the last Astronomy Daily podcast of 2017### Sources & Further Reading1. NASA (https://www.nasa.gov/) 2. European Space Agency (https://www.esa.int/) 3. Space.com (https://www.space.com/) ### Follow & ContactX/Twitter: @AstroDailyPod
Instagram: @astrodailypod
Email: hello@astronomydaily.io
Website: astronomydaily.io (http://astronomydaily.io/)
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00:00:00 --> 00:00:02 Welcome to Astronomy Daily, the podcast
00:00:02 --> 00:00:04 [music] that brings you the universe,
00:00:04 --> 00:00:07 one story at a time. I'm Avery.
00:00:07 --> 00:00:09 >> And I'm Anna. It's great to have you
00:00:09 --> 00:00:11 with us. Today, we've [music] got a
00:00:11 --> 00:00:13 packed episode. We'll be looking at how
00:00:13 --> 00:00:15 giant stars might be spreading life's
00:00:15 --> 00:00:17 building blocks in a way we never
00:00:17 --> 00:00:18 expected.
00:00:18 --> 00:00:19 >> We'll also dive into [music] the
00:00:20 --> 00:00:22 mysterious origins of hot Jupiters,
00:00:22 --> 00:00:24 check out some newly discovered caves on
00:00:24 --> 00:00:26 Mars that could be hiding signs of life,
00:00:26 --> 00:00:28 [music] and take a breathtaking tour of
00:00:28 --> 00:00:31 the cosmos. courtesy of the James Webb
00:00:31 --> 00:00:32 Space [music] Telescope.
00:00:32 --> 00:00:34 >> Plus, a roundup of rocket launches this
00:00:34 --> 00:00:36 week and a significant step forward for
00:00:36 --> 00:00:38 Iran's space program. So, let's [music]
00:00:38 --> 00:00:40 get started with our first story, which
00:00:40 --> 00:00:42 could rewrite our understanding of how
00:00:42 --> 00:00:44 stars seed the cosmos. [music]
00:00:44 --> 00:00:47 >> I'm intrigued. What's the latest?
00:00:47 --> 00:00:49 >> Well, for a long time, astronomers
00:00:49 --> 00:00:51 believed that the winds from red giant
00:00:51 --> 00:00:53 stars were driven by a simple mechanism.
00:00:53 --> 00:00:55 The pressure of starlight pushing on
00:00:55 --> 00:00:57 tiny grains of dust.
00:00:57 --> 00:00:59 >> Right? Like a solar sail but on a
00:00:59 --> 00:01:02 microscopic scale. This process was
00:01:02 --> 00:01:03 thought to be responsible for spreading
00:01:03 --> 00:01:05 heavy elements like the carbon in our
00:01:05 --> 00:01:07 bodies across the galaxy.
00:01:07 --> 00:01:10 >> Exactly. But a new study focusing on the
00:01:10 --> 00:01:13 red giant star R Datus is challenging
00:01:13 --> 00:01:15 that entire idea. After careful
00:01:15 --> 00:01:17 observation, researchers found that the
00:01:18 --> 00:01:20 dust grains forming around this star are
00:01:20 --> 00:01:22 simply too small.
00:01:22 --> 00:01:24 >> Too small. So, the push from the stars
00:01:24 --> 00:01:26 light isn't strong enough to drive the
00:01:26 --> 00:01:29 stellar wind out into space.
00:01:29 --> 00:01:31 >> Precisely. The physics just doesn't add
00:01:31 --> 00:01:34 up. This suggests other more powerful
00:01:34 --> 00:01:36 forces must be at play. The study points
00:01:36 --> 00:01:38 to possibilities like giant convective
00:01:38 --> 00:01:41 bubbles similar to water boiling in a
00:01:41 --> 00:01:43 pot or powerful stellar pulsations that
00:01:44 --> 00:01:46 physically throw material outwards.
00:01:46 --> 00:01:49 >> Wow. So, it's less of a gentle push and
00:01:49 --> 00:01:52 more of a cosmic eruption. That's a huge
00:01:52 --> 00:01:53 shift in thinking.
00:01:53 --> 00:01:55 >> It is. It means we have to reconsider
00:01:55 --> 00:01:57 one of the fundamental processes of how
00:01:57 --> 00:01:59 galaxies are enriched with the elements
00:01:59 --> 00:02:02 necessary for planets and ultimately for
00:02:02 --> 00:02:04 life itself.
00:02:04 --> 00:02:06 >> From the end of a star's life, let's
00:02:06 --> 00:02:08 jump to the formation of planets. We're
00:02:08 --> 00:02:10 talking about one of the strangest types
00:02:10 --> 00:02:12 of exoplanets out there, the hot
00:02:12 --> 00:02:13 Jupiters.
00:02:13 --> 00:02:16 >> Mhm. These are gas giants much like our
00:02:16 --> 00:02:18 own Jupiter, but they orbit incredibly
00:02:18 --> 00:02:21 close to their host stars, completing a
00:02:21 --> 00:02:23 full year in just a few Earth days. The
00:02:23 --> 00:02:26 big question has always been, how did
00:02:26 --> 00:02:27 they get there?
00:02:27 --> 00:02:29 >> One popular theory was called high
00:02:29 --> 00:02:31 eccentricity migration. It's a pretty
00:02:31 --> 00:02:33 chaotic process where a planet gets
00:02:33 --> 00:02:35 knocked around by other objects in the
00:02:35 --> 00:02:38 system, eventually flinging it into a
00:02:38 --> 00:02:40 tight close orbit. It sounds very
00:02:40 --> 00:02:42 violent, but new research looking at
00:02:42 --> 00:02:45 over 500 of these hot Jupiters suggests
00:02:45 --> 00:02:48 a much gentler path for many of them.
00:02:48 --> 00:02:50 The study found that about 30 of these
00:02:50 --> 00:02:52 worlds likely formed through a process
00:02:52 --> 00:02:53 called disc migration.
00:02:53 --> 00:02:56 >> Disc migration. So what does that
00:02:56 --> 00:02:57 entail? Is it calmer?
00:02:58 --> 00:03:00 >> Much calmer. In this scenario, the
00:03:00 --> 00:03:02 planet forms much farther out in the
00:03:02 --> 00:03:04 protolanetary disc, that big swirl of
00:03:04 --> 00:03:07 gas and dust a star is born from, and
00:03:07 --> 00:03:09 then it slowly spirals inward, migrating
00:03:09 --> 00:03:11 through the disc material until it
00:03:11 --> 00:03:14 settles into a close orbit. That makes
00:03:14 --> 00:03:16 sense. So, it's not always a game of
00:03:16 --> 00:03:18 planetary pinball. This really adds
00:03:18 --> 00:03:20 another important layer to our
00:03:20 --> 00:03:21 understanding of how planetary systems
00:03:22 --> 00:03:24 can evolve. Now, let's bring our focus a
00:03:24 --> 00:03:26 little closer to home with a quick
00:03:26 --> 00:03:28 roundup of recent and upcoming rocket
00:03:28 --> 00:03:30 launches. It's been a busy period as we
00:03:30 --> 00:03:34 close out 2025 and head into 2026.
00:03:34 --> 00:03:37 >> Absolutely. China has been particularly
00:03:37 --> 00:03:40 active with two recent launches. A Chong
00:03:40 --> 00:03:42 Xang 4B rocket took flight, as did a
00:03:42 --> 00:03:44 Chong Xang 7A.
00:03:44 --> 00:03:46 >> Meanwhile, SpaceX has been wrapping up
00:03:46 --> 00:03:48 its year. A Falcon 9 mission
00:03:48 --> 00:03:51 successfully deployed the CSG3 satellite
00:03:51 --> 00:03:53 for the Italian Space Agency, which
00:03:53 --> 00:03:55 officially marked the company's final
00:03:55 --> 00:03:58 mission for 2025. Right. And they're not
00:03:58 --> 00:04:00 wasting any time in the new year. The
00:04:00 --> 00:04:03 very first launch scheduled for 2026 is
00:04:03 --> 00:04:05 another Falcon 9. This time carrying a
00:04:05 --> 00:04:07 fresh batch of Starling satellites into
00:04:07 --> 00:04:10 orbit. The pace just never seems to slow
00:04:10 --> 00:04:11 down.
00:04:11 --> 00:04:13 >> It certainly doesn't. Sticking with our
00:04:13 --> 00:04:15 solar system, we have some incredible
00:04:15 --> 00:04:17 news from Mars that I'm very excited
00:04:17 --> 00:04:18 about.
00:04:18 --> 00:04:20 >> Oh, what's that?
00:04:20 --> 00:04:22 >> Chinese researchers have identified what
00:04:22 --> 00:04:24 they believe are eight potential carst
00:04:24 --> 00:04:27 caves in a region called Hebris Val.
00:04:27 --> 00:04:30 >> Carst caves. Okay. So, these aren't the
00:04:30 --> 00:04:33 usual volcanic lava tubes we've talked
00:04:33 --> 00:04:34 about before on the show.
00:04:34 --> 00:04:36 >> Exactly. And that's what makes this so
00:04:36 --> 00:04:39 significant. Carst caves are formed when
00:04:39 --> 00:04:41 water dissolves soluble rock like
00:04:41 --> 00:04:43 limestone. This is the first time this
00:04:44 --> 00:04:45 specific type of cave has been
00:04:45 --> 00:04:47 identified on Mars and it's a huge
00:04:47 --> 00:04:49 indicator of past water activity.
00:04:50 --> 00:04:52 >> Water, that's the magic word. So, this
00:04:52 --> 00:04:54 is a massive deal for the search for
00:04:54 --> 00:04:55 life, isn't it?
00:04:55 --> 00:04:58 >> It's a potential gamecher. The surface
00:04:58 --> 00:05:00 of Mars is blasted with harsh radiation
00:05:00 --> 00:05:02 which would destroy any delicate signs
00:05:02 --> 00:05:05 of life. But deep inside these caves,
00:05:05 --> 00:05:07 ancient bio signatures could have been
00:05:07 --> 00:05:09 preserved for billions of years,
00:05:09 --> 00:05:11 perfectly shielded from that hostile
00:05:11 --> 00:05:12 environment.
00:05:12 --> 00:05:14 >> They're like natural time capsules.
00:05:14 --> 00:05:15 These caves must have just shot to the
00:05:16 --> 00:05:17 top of the list for places we need to
00:05:17 --> 00:05:20 explore on Mars. Absolutely fascinating
00:05:20 --> 00:05:21 stuff.
00:05:21 --> 00:05:23 >> It really is. And from searching for
00:05:23 --> 00:05:26 hidden life to just admiring the sheer
00:05:26 --> 00:05:28 beauty of the universe, let's talk about
00:05:28 --> 00:05:30 the James Web Space Telescope.
00:05:30 --> 00:05:32 >> Right. It's hard to believe, but it
00:05:32 --> 00:05:33 recently celebrated the fourth
00:05:33 --> 00:05:35 anniversary of its launch.
00:05:35 --> 00:05:38 >> Four years of revolutionary science. To
00:05:38 --> 00:05:40 mark the occasion, the European Space
00:05:40 --> 00:05:42 Agency released a spectacular video that
00:05:42 --> 00:05:44 they're calling a fly through of the
00:05:44 --> 00:05:45 cosmos.
00:05:45 --> 00:05:47 >> I saw this and it is stunning. They've
00:05:47 --> 00:05:49 taken some of web's most iconic
00:05:49 --> 00:05:51 highresolution images and created these
00:05:52 --> 00:05:54 incredible zoomins. You feel like you're
00:05:54 --> 00:05:56 actually soaring through nebulas and
00:05:56 --> 00:05:59 past distant galaxy clusters. It gives
00:05:59 --> 00:06:01 you a real sense of depth and scale that
00:06:01 --> 00:06:02 you don't always get from a static
00:06:02 --> 00:06:05 image. They take you on this immersive
00:06:05 --> 00:06:07 journey through star forming regions and
00:06:07 --> 00:06:09 ancient galaxies. We'll be sure to put a
00:06:09 --> 00:06:10 link in the show notes because it's
00:06:10 --> 00:06:12 something you really have to see to
00:06:12 --> 00:06:13 believe.
00:06:13 --> 00:06:15 >> Definitely. It's a fantastic reminder of
00:06:16 --> 00:06:17 just how much this incredible
00:06:17 --> 00:06:19 observatory has shown us in only four
00:06:20 --> 00:06:22 years. For a final story today, we turn
00:06:22 --> 00:06:24 our attention back to Earth orbit.
00:06:24 --> 00:06:26 >> That's right. Iran has made a
00:06:26 --> 00:06:28 significant advancement in its national
00:06:28 --> 00:06:30 space program. The country successfully
00:06:30 --> 00:06:33 launched three of its domestically built
00:06:33 --> 00:06:35 earth observation satellites.
00:06:35 --> 00:06:38 >> The satellites are named PA Zafar 2 and
00:06:38 --> 00:06:41 Kowsar. And what's also notable here is
00:06:41 --> 00:06:42 how they got to orbit.
00:06:42 --> 00:06:44 >> The launch was conducted on a Russian
00:06:44 --> 00:06:46 Soyuse rocket taking off from the
00:06:46 --> 00:06:49 Vistoni Cosmodrome in Russia.
00:06:49 --> 00:06:51 >> This really highlights the growing space
00:06:51 --> 00:06:53 collaboration between the two nations.
00:06:53 --> 00:06:55 It provides Iran with reliable access to
00:06:55 --> 00:06:57 orbit while Russia gains a partner in
00:06:58 --> 00:06:59 various space activities.
00:06:59 --> 00:07:01 >> It's a major milestone for Iran's
00:07:01 --> 00:07:03 ambitions in space, allowing them to
00:07:03 --> 00:07:05 gather their own data for environmental
00:07:05 --> 00:07:07 monitoring, agriculture, and other
00:07:07 --> 00:07:09 national applications. It's a very
00:07:09 --> 00:07:11 strategic development.
00:07:11 --> 00:07:12 >> And that's all the time we have for
00:07:12 --> 00:07:15 today on Astronomy Daily. From the winds
00:07:15 --> 00:07:17 of red giants to hidden caves on Mars,
00:07:17 --> 00:07:19 the universe truly never fails to
00:07:20 --> 00:07:21 surprise us.
00:07:21 --> 00:07:22 >> We hope you've enjoyed the journey. You
00:07:22 --> 00:07:24 can find links to some of the things we
00:07:24 --> 00:07:26 discussed, including that incredible
00:07:26 --> 00:07:28 James Webb anniversary video on our
00:07:28 --> 00:07:31 website at astronomydaily.io.
00:07:31 --> 00:07:32 We'd love it if you'd subscribe wherever
00:07:32 --> 00:07:34 you get your podcasts. Thanks so much
00:07:34 --> 00:07:35 for tuning in.
00:07:35 --> 00:07:37 >> Until next time, keep looking up.
00:07:37 --> 00:07:41 Astronomy [music] day.
00:07:41 --> 00:07:49 Stories been told.
00:07:49 --> 00:07:52 Stories [music] told.