### Episode Summary
Real-time images of exploding stars, a surprisingly “gentle” supermassive black hole, the return of a long-duration Soyuz crew, a packed week of launches, Subaru’s first new exoplanet and brown-dwarf finds, and a controversial plan to light up the night sky with orbital mirrors.
### Timestamps & Stories
00:00 – Cold Open
00:35 – Intro
01:05 – **Story 1: Astronomers watch novae explode in real time**
**Key Facts**
- First-ever direct imaging of two novae as they erupted using the CHARA optical interferometer
- V1674 Herculis: fastest nova on record; brightened & faded in days; showed two perpendicular gas jets
- V1405 Cassiopeiae: visible to naked eye for months; delayed ejection after 50+ days
- Gamma-ray bursts from Fermi telescope timed perfectly with visible jets
03:35 – **Story 2: Soyuz MS-27 crew lands after 8-month ISS mission**
**Key Facts**
- Crew of three returned safely to Kazakhstan on 8 Dec 2025
- 260+ days in orbit (launched April 2025)
- Handover completed; ISS now at full Expedition strength for next rotation
05:05 – ** Story 3: Launch Roundup (8–15 Dec 2025) **
**Key Facts**
- SpaceX Starship Flight 6 (Texas) – major reusability test
- China Long March 7A – new Tiangong station module
- ULA Vulcan Centaur Cert-2 (Cape Canaveral) – second certification flight
- Rocket Lab Electron (New Zealand) – successful dawn launch
- Russia Soyuz-2.1b (Vostochny) – classified payload
06:35 – ** Story 4: Subaru Telescope’s first discoveries* *
**Key Facts**
- First science results from upgraded high-contrast infrared instruments
- New brown dwarf (13–80 Jupiter masses) with dusty disk
- New wide-orbit gas-giant exoplanet ~300 light-years away showing methane & water signatures
08:05 – ** Story 5: Sagittarius A* is less destructive than thought **
**Key Facts**
- Objects like G2/DSO, D9, X3, X7 all survive stable orbits within 0.8 parsecs of the 4-million-solar-mass black hole
- 20+ years of VLT data (SINFONI, NACO, ERIS) show no tidal disruption
- Galactic Center may be a star-formation zone rather than a shredder
09:55 – ** Story 6: Giant space mirrors to light up the night **
**Key Facts**
- Reflect Orbital plans thousands of mirror satellites by 2030
- Each beam ~5 km wide, 4× brighter than full moon
- Goal: extend solar-farm output after sunset & aid night rescues
- Astronomers warn of catastrophic light-pollution increase and wildlife disruption
11:20 – Outro
### Sources & Further Reading
1. https://connectsci.au/news/news-parent/7462/Astronomers-watch-stars-explode-in-real-time-and
2. https://www.nasa.gov/blogs/spacestation/2025/12/09/soyuz-crew-lands-ending-eight-month-space-research-journey/ (https://www.nasa.gov/blogs/spacestation/2025/12/09/soyuz-crew-lands-ending-eight-month-space-research-journey/)
3. https://www.nasaspaceflight.com/2025/12/launch-roundup-120825/ (https://www.nasaspaceflight.com/2025/12/launch-roundup-120825/)
4. https://www.space.com/astronomy/exoplanets/the-subaru-telescope-just-made-its-1st-discoveries-a-failed-star-and-an-exoplanet (https://www.space.com/astronomy/exoplanets/the-subaru-telescope-just-made-its-1st-discoveries-a-failed-star-and-an-exoplanet)
5. https://www.universetoday.com/articles/the-milky-ways-supermassive-black-hole-isnt-as-destructive-as-thought (https://www.universetoday.com/articles/the-milky-ways-supermassive-black-hole-isnt-as-destructive-as-thought)
6. https://dailygalaxy.com/2025/12/giant-space-mirrors-to-light-up-the-night/ (https://dailygalaxy.com/2025/12/giant-space-mirrors-to-light-up-the-night/)
# ## Quick Quotes
- “High-definition video of stellar explosions.” – Elias Aydi
- “Sagittarius A* is less destructive than was previously thought.” – Florian Peißker
- “Catastrophic for astronomy.” – Robert Massey (on orbital mirrors)
### Follow & Contact
X/Twitter: @AstroDailyPod
Instagram: @astrodailypod
Email: hello@astronomydaily.io
Website: astronomydaily.io
Clear skies and see you tomorrow! 🌟
Become a supporter of this podcast: https://www.spreaker.com/podcast/astronomy-daily-space-news-updates--5648921/support (https://www.spreaker.com/podcast/astronomy-daily-space-news-updates--5648921/support?utm_source=rss&utm_medium=rss&utm_campaign=rss) .
Sponsor Details:
Ensure your online privacy by using NordVPN . To get our special listener deal and save a lot of money, visit You'll be glad you did!
Become a supporter of Astronomy Daily by joining our Supporters Club. Commercial free episodes daily are only a click way... Click Here (https://www.spreaker.com/podcast/astronomy-daily-space-news-updates--5648921/support)
This episode includes AI-generated content.
Episode link: https://play.headliner.app/episode/30542331?utm_source=youtube
00:00:00 --> 00:00:03 Imagine watching a star erupt in high
00:00:03 --> 00:00:06 definition frame by frame, gas jets
00:00:06 --> 00:00:09 twisting like cosmic fireworks. Or
00:00:09 --> 00:00:11 discovering that our galaxy's monstrous
00:00:11 --> 00:00:13 black hole isn't the destroyer we
00:00:13 --> 00:00:16 feared. Today on Astronomy Daily, we're
00:00:16 --> 00:00:19 unpacking Nove caught in the act. Stable
00:00:20 --> 00:00:23 survivors orbiting Sagittarius AAR and a
00:00:23 --> 00:00:25 bold plan to beam sunlight into the
00:00:26 --> 00:00:28 night sky. But at what cost to the stars
00:00:28 --> 00:00:31 above? I'm Anna here with my co-host
00:00:31 --> 00:00:35 Avery. Let's dive in. Hello stargazers,
00:00:35 --> 00:00:38 and welcome to Astronomy Daily for
00:00:38 --> 00:00:42 December 9th, 2025. I'm Anna, your guide
00:00:42 --> 00:00:44 through the cosmos from the ground up.
00:00:44 --> 00:00:47 >> And I'm Avery, orbiting right alongside
00:00:47 --> 00:00:49 you. Whether you're sipping coffee under
00:00:49 --> 00:00:51 city lights or chasing dark skies in the
00:00:51 --> 00:00:53 wild, we've got the latest in space and
00:00:53 --> 00:00:56 astronomy to fuel your wonder. Today,
00:00:56 --> 00:00:58 we're blending breakthroughs in stellar
00:00:58 --> 00:01:00 explosions, galactic survival stories,
00:01:00 --> 00:01:02 and even the futuristic twist on
00:01:02 --> 00:01:04 illuminating Earth while keeping our
00:01:04 --> 00:01:07 telescopes trained on the heavens. Anna,
00:01:07 --> 00:01:08 what's got you buzzing today?
00:01:08 --> 00:01:11 >> Oh, Avery, it's those real time nova
00:01:11 --> 00:01:13 observations. It's like the universe
00:01:13 --> 00:01:15 handed us a front row seat to stellar
00:01:15 --> 00:01:18 drama. But let's start there and work
00:01:18 --> 00:01:19 our way out.
00:01:19 --> 00:01:22 >> Okay, kicking things off with the cosmic
00:01:22 --> 00:01:24 blockbuster. Astronomers have captured
00:01:24 --> 00:01:27 stars exploding in real time and what
00:01:27 --> 00:01:29 they saw has rewritten the script on
00:01:29 --> 00:01:32 nove published just yesterday in nature
00:01:32 --> 00:01:34 astronomy. This study used the center
00:01:34 --> 00:01:37 for high angular resolution astronomy or
00:01:37 --> 00:01:39 charara array for short in California to
00:01:39 --> 00:01:41 image two nove as they unfolded
00:01:41 --> 00:01:43 revealing ejections far more complex
00:01:43 --> 00:01:47 than a simple blast. Right, Avery. Nove
00:01:47 --> 00:01:50 aren't supernova. They're thermonuclear
00:01:50 --> 00:01:52 runaways on white dwarfs siphoning
00:01:52 --> 00:01:54 material from companion stars. But
00:01:54 --> 00:01:57 instead of a straightforward shell of
00:01:57 --> 00:01:59 gas, these events showed
00:01:59 --> 00:02:03 multidirectional outflows. Take the 1674
00:02:03 --> 00:02:06 Hercules, the fastest nova on record. It
00:02:06 --> 00:02:09 brightened and faded in mere days about
00:02:09 --> 00:02:13 6 to 29 lighty years away in our
00:02:13 --> 00:02:16 galaxy. Charara's intererometry,
00:02:16 --> 00:02:18 basically combining light from multiple
00:02:18 --> 00:02:21 telescopes for super high resolution,
00:02:21 --> 00:02:24 caught two perpendicular jets of gas
00:02:24 --> 00:02:26 timed perfectly with gammaray bursts
00:02:26 --> 00:02:28 detected by NASA's Fermy Space
00:02:28 --> 00:02:31 Telescope. And don't forget V1405
00:02:31 --> 00:02:34 Cassiopia, the slow burner at 5600
00:02:34 --> 00:02:36 light-years out. It peaked for nearly
00:02:36 --> 00:02:39 200 days, bright enough to spot with the
00:02:39 --> 00:02:41 naked eye. The white dwarf held onto its
00:02:41 --> 00:02:44 outer layers for over 50 days before a
00:02:44 --> 00:02:46 delayed ejection again sinking with
00:02:46 --> 00:02:49 those high energy gammaray rays. It's
00:02:49 --> 00:02:51 like the star was staging a multi-act
00:02:51 --> 00:02:51 play.
00:02:51 --> 00:02:54 >> Lead author Elias a from Texas Tech
00:02:54 --> 00:02:57 calls it a shift from grainy black and
00:02:57 --> 00:03:00 white to highdefin video. He told
00:03:00 --> 00:03:02 reporters, "These observations allow us
00:03:02 --> 00:03:05 to watch a stellar explosion in real
00:03:05 --> 00:03:08 time, uncovering the true complexity of
00:03:08 --> 00:03:10 how these explosions unfold." Gail
00:03:10 --> 00:03:13 Schaefer, Cher's director at Georgia
00:03:13 --> 00:03:15 State, emphasized the text's
00:03:15 --> 00:03:17 flexibility. Catching these transient
00:03:17 --> 00:03:20 events requires adapting our schedule as
00:03:20 --> 00:03:22 targets of opportunity pop up.
00:03:22 --> 00:03:25 >> Absolutely. As Laura Chomc from Michigan
00:03:25 --> 00:03:27 State puts it, nove are laboratories for
00:03:27 --> 00:03:29 extreme physics, linking nuclear
00:03:29 --> 00:03:31 reactions on the star surface to the
00:03:32 --> 00:03:34 geometry of ejected material and that
00:03:34 --> 00:03:37 zippy gammaray radiation. This could
00:03:37 --> 00:03:38 reshape how we model binary star
00:03:38 --> 00:03:41 evolution and even galactic chemistry.
00:03:41 --> 00:03:43 >> The realing stuff. If you're an amateur
00:03:43 --> 00:03:46 imager, keep an eye on the skies. These
00:03:46 --> 00:03:48 targets of opportunity remind us the
00:03:48 --> 00:03:50 universe doesn't wait. Shifting from
00:03:50 --> 00:03:53 stellar blasts to human ones, the soy
00:03:53 --> 00:03:55 use MS-27 crew splashed down safely
00:03:55 --> 00:03:57 yesterday, wrapping up an eight-month
00:03:57 --> 00:03:59 stint on the International Space
00:03:59 --> 00:04:02 Station. NASA reports the trio, NASA
00:04:02 --> 00:04:04 astronaut Johnny Kim and Ross Cosmos
00:04:04 --> 00:04:07 Cosmonaut Sergey Raichov and Alexe
00:04:07 --> 00:04:09 Zubertsky touched down in Kazakhstan
00:04:09 --> 00:04:11 after over 260 days in orbit.
00:04:12 --> 00:04:14 >> It's a textbook return. Avery launched
00:04:14 --> 00:04:16 last spring. Their mission overlapped
00:04:16 --> 00:04:19 with key station upgrades and a packed
00:04:19 --> 00:04:21 research calendar. While specifics on
00:04:21 --> 00:04:23 astronomical experiments are still
00:04:24 --> 00:04:26 filtering in, this crew contributed to
00:04:26 --> 00:04:28 ongoing solar observations and
00:04:28 --> 00:04:30 microgravity fluid dynamics that
00:04:30 --> 00:04:33 indirectly support astrophysics modeling
00:04:33 --> 00:04:35 like simulating plasma flows in stellar
00:04:35 --> 00:04:37 atmospheres.
00:04:37 --> 00:04:39 >> True. And it's a handover moment. The
00:04:39 --> 00:04:41 station's now prepped for the next
00:04:41 --> 00:04:43 rotation, keeping that continuous human
00:04:44 --> 00:04:46 presence humming. No major hitches on
00:04:46 --> 00:04:49 descent per NASA's blog. Undocking
00:04:49 --> 00:04:51 smooth de-orbit burn on point and a
00:04:51 --> 00:04:55 balmy step landing at dawn local time.
00:04:55 --> 00:04:57 >> 8 months is no small feat. These
00:04:58 --> 00:05:00 missions remind us that while we chase
00:05:00 --> 00:05:03 exploding stars from afar, boots, or
00:05:03 --> 00:05:05 rather spac suits in orbit, are building
00:05:05 --> 00:05:07 the data pipelines for tomorrow's
00:05:07 --> 00:05:11 discoveries. Welcome home, crew. Now,
00:05:11 --> 00:05:13 for the adrenaline junkies, our weekly
00:05:13 --> 00:05:15 launch roundup is stacked. NSF
00:05:15 --> 00:05:17 Spaceflight.com's December 8th update
00:05:17 --> 00:05:20 highlights a global frenzy. China,
00:05:20 --> 00:05:24 Russia, Rocket Lab, ULA, and SpaceX all
00:05:24 --> 00:05:26 lighting up the pad this week. Leading
00:05:26 --> 00:05:29 the pack, SpaceX's Starship Flight 6
00:05:29 --> 00:05:32 test from Starbase, Texas, eyeing rapid
00:05:32 --> 00:05:34 reusability tweaks after last month's
00:05:34 --> 00:05:38 hop. Over in China, a Long March 7A
00:05:38 --> 00:05:41 lofted more Tiangong station modules,
00:05:41 --> 00:05:43 bolstering their orbital lab. Russia's
00:05:43 --> 00:05:47 Soyuse 2.1b from Mto Stoi sent a
00:05:47 --> 00:05:49 classified payload skyward. No spoilers,
00:05:49 --> 00:05:52 but whispers of Comsat upgrades.
00:05:52 --> 00:05:55 Rocket Labs Electron nailed a Dawn
00:05:55 --> 00:05:57 launch from New Zealand, deploying small
00:05:57 --> 00:05:59 sats for Earth observation that double
00:05:59 --> 00:06:01 as calibration tools for astronomy
00:06:02 --> 00:06:04 ground stations. And ULA's Vulcan
00:06:04 --> 00:06:07 Centaur roared on its second flight from
00:06:07 --> 00:06:09 Cape Canaveral, hauling CERT payloads
00:06:09 --> 00:06:12 towards GEO, key for future deep space
00:06:12 --> 00:06:13 relays.
00:06:13 --> 00:06:15 >> No major scrubbers, reported though.
00:06:15 --> 00:06:17 Weather nipped at a few heels. These
00:06:17 --> 00:06:19 aren't just fireworks. There are the
00:06:19 --> 00:06:22 supply lines for telescopes in space and
00:06:22 --> 00:06:24 probes to the stars. If you're tracking
00:06:24 --> 00:06:27 live, apps like NSFs are gold.
00:06:28 --> 00:06:30 >> Agreed. It's a reminder that astronomy
00:06:30 --> 00:06:33 thrives on reliable rides to orbit.
00:06:33 --> 00:06:35 >> Over to exoplanet hunting. The Subaru
00:06:36 --> 00:06:38 telescope in Hawaii has scored its
00:06:38 --> 00:06:41 inaugural discoveries. A failed star
00:06:41 --> 00:06:44 brown dwarf and an intriguing exoplanet,
00:06:44 --> 00:06:46 marking a milestone for its upgraded
00:06:46 --> 00:06:48 infrared capabilities.
00:06:48 --> 00:06:51 Subaru's no newbie, but these finds
00:06:51 --> 00:06:53 detailed in a freshpace.com report
00:06:53 --> 00:06:56 showcase its revamped seed survey. The
00:06:56 --> 00:06:59 brown dwarf, lurking in a nearby system,
00:06:59 --> 00:07:01 clocks in at just 13 to 80 Jupiter
00:07:01 --> 00:07:03 masses, too lightweight for hydrogen
00:07:03 --> 00:07:06 fusion, hence the failed tag. But it's
00:07:06 --> 00:07:09 got a dusty disc hinting at potential
00:07:09 --> 00:07:12 planet formation. And the exoplanet, a
00:07:12 --> 00:07:14 gas giant orbiting a young sunlike star
00:07:14 --> 00:07:17 about 300 lighty years out with an
00:07:17 --> 00:07:19 orbital tilt suggesting a dramatic
00:07:19 --> 00:07:21 formation history. Maybe a gravitational
00:07:21 --> 00:07:24 slingshot from siblings. High contrast
00:07:24 --> 00:07:26 imaging pierced the glare revealing
00:07:26 --> 00:07:28 spectral signatures of methane and water
00:07:28 --> 00:07:29 vapor.
00:07:29 --> 00:07:32 >> Implications. This duo pushes our census
00:07:32 --> 00:07:35 of substellar objects and wide orbit
00:07:35 --> 00:07:37 worlds, refining models of how solar
00:07:37 --> 00:07:40 systems assemble. Subaru is pointing the
00:07:40 --> 00:07:43 way for JWST follow-ups.
00:07:43 --> 00:07:45 >> A stellar debut, pun intended.
00:07:45 --> 00:07:48 >> Speaking of galactic neighbors, new
00:07:48 --> 00:07:50 research in astronomy and astrophysics
00:07:50 --> 00:07:53 reveals our Milky Way's super massive
00:07:53 --> 00:07:56 black hole, Sagittarius A star, isn't
00:07:56 --> 00:07:58 the wrecking ball we imagined. Lead
00:07:58 --> 00:08:01 author Florian Per's team tracked
00:08:01 --> 00:08:04 oddballs like G2/DSO,
00:08:04 --> 00:08:07 D9, X3, and X7 over two decades with the
00:08:08 --> 00:08:10 very large telescopes Symphony and NCO
00:08:10 --> 00:08:14 instruments plus fresh 2024 AIS data.
00:08:14 --> 00:08:16 These objects in the dense central
00:08:16 --> 00:08:18 parseek where stellar crowds are
00:08:18 --> 00:08:21 millions of times our local density
00:08:21 --> 00:08:24 follow stable Keeperan orbits hugging
00:08:24 --> 00:08:26 within 08 parsects of Sagittarius A
00:08:26 --> 00:08:31 stars 4 million solar mass grip. G2/DSO
00:08:31 --> 00:08:34 not a doomed gas cloud but a star
00:08:34 --> 00:08:36 shrouded in one resisting tidal
00:08:36 --> 00:08:37 spaghettification.
00:08:37 --> 00:08:41 D9's a binary pair cruising steady. X7's
00:08:41 --> 00:08:43 elongated Bowshock form is
00:08:43 --> 00:08:46 northwardbound untouched. X3 a young
00:08:46 --> 00:08:49 stellar or stellar unit accelerates but
00:08:49 --> 00:08:50 stays on track.
00:08:50 --> 00:08:52 >> Per notes the fact that these objects
00:08:52 --> 00:08:55 move in such a stable manner so close to
00:08:55 --> 00:08:58 a black hole is fascinating. Sagittarius
00:08:58 --> 00:09:00 A star is less destructive than was
00:09:00 --> 00:09:03 previously thought. Co-alker Michael
00:09:03 --> 00:09:06 Giaek adds, "It can stimulate star
00:09:06 --> 00:09:08 formation or exotic dusty objects via
00:09:08 --> 00:09:10 binary mergers.
00:09:10 --> 00:09:12 >> This paints the galactic center as a
00:09:12 --> 00:09:15 stellar nursery lab, not a shredder,
00:09:15 --> 00:09:17 challenging destruction models and
00:09:17 --> 00:09:20 opening doors to black hole ecology."
00:09:20 --> 00:09:23 >> Mindbending. Our black holes got a soft
00:09:23 --> 00:09:24 spot.
00:09:24 --> 00:09:27 >> Okay, wrapping with a provocative
00:09:27 --> 00:09:30 proposal. Startup Reflect Orbital wants
00:09:30 --> 00:09:32 to launch thousands of mirror laden
00:09:32 --> 00:09:35 satellites by 2030 to beam sunlight
00:09:35 --> 00:09:37 earth at night, lighting solar farms,
00:09:37 --> 00:09:40 aiding rescues. But astronomers are
00:09:40 --> 00:09:42 sounding alarms on the fallout.
00:09:42 --> 00:09:45 >> The plan, low Earth orbit satellites
00:09:45 --> 00:09:48 with panels focusing beams of sunlight
00:09:48 --> 00:09:51 over 5 km spots, four times brighter
00:09:51 --> 00:09:53 than a full moon. Proponents tout
00:09:53 --> 00:09:56 roundthe-clock solar power, but critics
00:09:56 --> 00:09:58 crunch the numbers. Samantha Lawler from
00:09:58 --> 00:10:01 the University of Regina says it yield
00:10:01 --> 00:10:04 mere millows per panel needing a hordes
00:10:04 --> 00:10:07 focused on one spot to matter.
00:10:07 --> 00:10:10 >> The real thing for astronomy it's sky
00:10:10 --> 00:10:13 flooding light pollution on steroids.
00:10:13 --> 00:10:15 Robert Massie of the Royal Astronomical
00:10:15 --> 00:10:18 Society calls it catastrophic scrambling
00:10:18 --> 00:10:21 observations of faint stars and planets.
00:10:21 --> 00:10:23 John Barentine from Silverado Hills
00:10:23 --> 00:10:25 Observatory warns of scattered beams
00:10:25 --> 00:10:28 disrupting wildlife navigation. Birds,
00:10:28 --> 00:10:31 insects, migrants via atmospheric glow.
00:10:32 --> 00:10:34 Aaron Bolley from UBC pushes rooftops
00:10:34 --> 00:10:36 over orbits. More efficient and
00:10:36 --> 00:10:37 sustainable.
00:10:37 --> 00:10:40 >> A double-edged sword. Innovation versus
00:10:40 --> 00:10:43 the dark we need for discovery.
00:10:43 --> 00:10:45 >> And that's our cosmic dispatch for
00:10:45 --> 00:10:49 December 9th, 2025. From exploding nove
00:10:49 --> 00:10:52 to orbiting survivors, it's a universe
00:10:52 --> 00:10:55 full of surprises, gentle and fierce.
00:10:55 --> 00:10:57 >> Thanks for joining us on Astronomy
00:10:57 --> 00:11:00 Daily. Tune in tomorrow for more. Got
00:11:00 --> 00:11:02 thoughts on space mirrors? Hit us on
00:11:02 --> 00:11:05 social at Astro Daily Pod.
00:11:05 --> 00:11:08 >> Clear skies, everyone. I'm Avery
00:11:08 --> 00:11:14 >> and I'm Anna. Keep looking up.
00:11:14 --> 00:11:21 told
00:11:21 --> 00:11:29 stories told
00:11:29 --> 00:11:32 stories