From Betelgeuse's Secrets to Lunar Wonders: Your Daily Space Update

0:00 Anna: Welcome to Astronomy Daily, the podcast

0:03 where we chat about the coolest space and

0:05 astronomy news we can source. I'm Anna,

0:08 um, and with me is my co host, Avery.

0:11 Hey Avery, it's January 8,

0:14 2026. How's your week going?

0:16 Avery: Hey Anna. And hello to all our listeners.

0:19 It's been fantastic. Clear nights for

0:22 some stargazing. We've got a stellar lineup

0:25 today. Mysteries solved on a famous star.

0:27 A decades long supernova video,

0:30 a cens nearby stars for life,

0:33 lunar events to watch, a dramatic but

0:36 low risk orbital scenario, and fresh

0:39 insights on asteroid mining. Plenty to

0:42 unpack. Let's get started.

0:44 Anna: Leading off with big news from Orion,

0:47 astronomers have finally cracked Betelgeuse's

0:49 biggest mystery. The cause of its weird

0:52 brightness swings and that dramatic great

0:54 dimming back in 2020.

0:57 Avery: Yeah, this red supergiant, one of the

0:59 brightest stars in the sky and about 650

1:02 light years, has been puzzling folks

1:05 forever. With its pulsations, it has a short

1:08 400 day cycle from internal throbbing.

1:11 But there's this longer 2100 day

1:14 variation that stumped everyone. Theories

1:16 range from giant convection cells to dust

1:19 clouds or even a companion star.

1:22 Anna: Turns out it is a hidden companion.

1:25 Researchers from the Centre for Astrophysics

1:27 at Harvard and Smithsonian, led by Andrea

1:30 Dupre, used nearly eight years of Hubble

1:33 data plus ground telescopes to

1:35 direct evidence. The companion, playfully

1:38 called Siwarha, orbits every six years or

1:41 so, ploughing through Betelgeuse's massive

1:44 extended atmosphere. Like a boat cutting

1:46 through water, leaving a dense wake of gas.

1:49 Avery: That wake disrupts the star's light and

1:52 spectrum, causing the dimming and patterns we

1:54 see. Dupree described it perfectly. It's a

1:57 bit like a boat moving through water. The

2:00 companion star creates a ripple effect in

2:02 Betelgeuse's atmosphere that we can actually

2:04 see. In the data they caught the wake form

2:07 forming right after the companion passes in

2:09 front.

2:10 Anna: This explains the 2020 sneeze too.

2:13 Dust and gas from that interaction. Huge

2:16 implications. It shows how companions can

2:19 reshape massive stars. Evolution, mass

2:22 loss and eventual supernovae.

2:24 Betelgeuse is eclipsing Siwarha right now,

2:27 but they'll watch for it emerging in 2027.

2:30 Avery: Front row. See to a star's dramatic life.

2:34 Love it.

2:34 Anna: Next, NASA dropped an incredible video

2:37 that's literally decades in the making. A

2:40 time lapse of Kepler's supernova remnant

2:43 from Chandra Xway Observatory data.

2:46 Avery: This is the remnant from the supernova

2:48 spotted by Johannes Kepler in 1604.

2:51 A, uh, type 1A explosion from a white dwarf

2:54 that blew up after Gaining too much mass,

2:56 maybe from a companion or merger. It's about

2:59 17,000 light years away and

3:01 Chandra's been watching since 2000.

3:04 Anna: The video combines observations from

3:06 2000-2004-2006-2014

3:10 and even in 2025 over

3:13 25 years. It shows this neon

3:16 blue X ray ring expanding like a balloon

3:19 overlaid on optical light. The bottom side

3:22 blasts out faster at 13.8

3:25 million miles per hour while the top lags

3:28 at 4 million miles per hour because it hits

3:30 denser gas, Chandra.

3:32 Avery: Glows in blue from million degree material

3:34 and the rim measurements tell us about the

3:37 explosion's power and surroundings. It's the

3:39 longest spanning Chandra video ever showing

3:43 remnant crashes into space stuff hurling

3:45 elements for new stars and planets.

3:48 Anna: Mind blowing to see cosmic history unfold.

3:51 Avery: Frame by frame Shifting closer to

3:54 home, a uh new all sky census of over

3:57 2100 K dwarfs within about

3:59 130 light years reveals some prime real

4:02 estate for potential life bearing planets.

4:05 Anna: K dwarfs are cooler, fainter orange

4:08 stars twice as common as sun like G

4:10 dwarfs nearby and they live way longer,

4:13 giving planets stable rates radiation for

4:16 billions more years Perfect for life to

4:19 evolve slowly.

4:20 Avery: The team use high res spectrometers on

4:22 telescopes in Chile and Arizona for full sky

4:25 coverage. They measured temperatures,

4:28 ages, spin rates, magnetic activity

4:31 all key for habitability since flaring

4:33 stars can strip atmospheres.

4:35 Anna: This spectroscopic recon is a goldmine

4:38 data set for future exoplanet hunts and even

4:41 interstellar travel planning Presented just

4:44 this week at the AAS meeting.

4:47 Foundational for decades makes you wonder

4:50 how.

4:50 Avery: Many Earth likes are chilling around these

4:52 steady stars.

4:53 Anna: For sky watchers, especially down south,

4:56 2026 has some lunar a red

4:59 moon from a total eclipse, a blue moon and

5:02 a Christmas Eve supermoon.

5:04 Avery: The total lunar eclipse on March 3 evening

5:07 will turn the moon coppery red as Earth's

5:09 atmosphere bends sunset light onto it.

5:12 Totality's best from the Southern hemisphere

5:14 Australia, New Zealand lasting about an hour

5:18 visible even in cities Naked eye Then a.

5:20 Anna: Blue moon on May 31 the second full

5:23 moon in a month. A calendar quirk every

5:26 couple years and December 24

5:28 supermoon full moon at perigee

5:31 looking bigger and brighter. Perfect illusion

5:34 at moonrise.

5:35 Avery: No equipment needed. Safe to watch. Mark

5:38 those calendars for some magical nights.

5:40 Anna: Now Headline grabber Could a passing

5:43 star fling Earth into deep space,

5:46 destabilising our orbit faster than thought?

5:49 Avery: This comes from simulations by Nathan Kaib

5:52 and Sean Raymond factoring in galactic

5:54 flybys stars passing within 100

5:57 AU at slow speeds. Normally

6:00 solar system models assume isolation, but

6:03 Reality includes these encounters.

6:05 Anna: Mercury's the weak link. A flyby could make

6:08 its orbit more eccentric, leading to crashes

6:11 or tugs that cascade outward. Maybe

6:13 Venus or Mars Nudging Earth toward

6:16 Jupiter for a slingshot ejection.

6:19 Avery: Probability about 0.2%

6:22 chance over the next 5 billion years for

6:24 Earth ejection or collision Tiny,

6:27 but higher than old estimates. Pluto's risk

6:30 is 4 to 5%, based on Gaia

6:33 data and AARXIVE paper Real science. But

6:36 the article amps up the drama with hidden

6:38 threat vibes.

6:39 Anna: Comforting to know it's super rare. Are

6:41 orbits stable for aeons?

6:43 Avery: Last up Is asteroid mining actually

6:46 feasible? New chemistry data from meteorites

6:49 offers sobering but insightful answers.

6:52 Anna: Researchers analysed Carbonius chondrites

6:55 proxies for C type asteroids. Measuring

6:58 46 elements, these primitive rocks

7:01 mix metals, silicates, water

7:03 bearing stuff. But impacts create

7:06 breccias and regolith, making separation

7:08 tough in low gravity.

7:10 Avery: Some groups show enriched titanium or rare

7:13 Earths, but overall depleted in easy metals

7:16 like copper. Water alteration oxidises

7:19 things, complicating extraction. Led by

7:21 Joseph Tirigo Rodriguez and team, it suggests

7:24 mining's hard for bulk profit, better for

7:27 targeted water or in space manufacturing.

7:30 Anna: Focus on sample returns like Osiris Rex

7:33 to pick winners. Feasible eventually with

7:36 tech advances, but not a quick space gold

7:38 rush.

7:39 Avery: Realistic view Space resources for

7:42 exploration, not Earth riches.

7:44 Anna: Whew.

7:45 Uh, from stellar companions to lunar lights

7:47 in cosmic risks, what a ride Today.

7:50 Avery: The universe never runs out of storeys.

7:52 Thanks for joining us on Astronomy Daily.

7:54 Anna: We appreciate every listen, subscribe, share

7:57 and we'll catch you tomorrow with more. Keep

7:59 looking up Clear skive.