Comet Encounters, Early Universe Revelations, and Solar Rain Secrets

0:00 Anna: Welcome to Astronomy Daily. I'm Anna.

0:02 Avery: And I'm Avery. It's great to have you with us

0:05 for your essential daily update on everything

0:08 happening in the cosmos. We've got a packed

0:11 show for you today.

0:12 Anna: Indeed, we'll be talking about exciting

0:14 comets, including an interstellar visitor.

0:17 We'll delve into surprising findings about

0:19 the early universe, uncover why it rains on

0:22 the sun, and catch up on the latest rocket

0:24 launches.

0:25 Avery: Absolutely, Anna.

0:26 Uh, let's kick things off with Comet C by

0:29 2025. A6lem this

0:32 comet is putting on an encore appearance at

0:35 dusk this October, joining Comet R2

0:38 Swan in what promises to be a

0:40 fantastic show for observers.

0:43 Anna: Asics LEMMON slides past Earth at about twice

0:45 the distance of R2 Swan just 24 hours

0:48 later. Both are currently fine objects for

0:51 binoculars or a small telescope vying for top

0:53 spot at around magnitude

0:55 6A6 LEMMON was.

0:57 Avery: Discovered by astronomer D. Carson Fuls

1:01 during the Mount Lemmon Sky Survey back on

1:03 January 3rd. It's proven to be a

1:06 dependable performer. Crossing from the

1:09 constellation Leominer into Ursa

1:12 Major recently just below the famous Big.

1:15 Anna: Dipper A6 LEMMON is on a roughly

1:17 1350 year inbound orbit. Its path

1:20 will be slightly tweaked by Jupiter. It

1:22 reaches its closest point to the sun or

1:24 perihelion at Ah, 0.53

1:27 astronomical units from the sun on November

1:29 8th.

1:30 Avery: Then it's off to a chilly aphelion beyond the

1:33 main kuiper belt at uh, 219 AU

1:36 from the sun around 3175 AD.

1:39 Anna: Good news is a 6 lemon seems to be

1:42 brightening slightly ahead of predictions. It

1:44 maxes out in northern declination on October

1:47 10th and actually goes circumpolar for

1:49 observers north of the 50th parallel,

1:52 roughly above London and Vancouver around the

1:55 same date.

1:56 Avery: From mid latitude Northern Hemisphere

1:58 observers, it's transitioning to the evening

2:00 sky. By mid month a 6 lemon will

2:03 hug the western horizon, never getting much

2:06 higher than 20 degrees an hour after sunset.

2:08 Unlike R2 Swan, we can always hope.

2:11 Anna: For an outburst to enhance its visibility.

2:13 Remember, comet magnitudes can deceive.

2:16 A comet's light gets smeared out, often

2:18 needing to be around third magnitude to be

2:20 seen without binoculars.

2:22 Avery: To actually look like a comet with a fuzzy

2:24 head and a tail, it needs to be even brighter

2:27 around first magnitude or better. But

2:30 don't let this deter you from your cometary

2:32 quest.

2:33 Anna: Both Artoo Swan and Asics LEMMON should make

2:36 excellent binocular objects right around

2:37 Halloween. Asics LEMMON then starts to

2:40 head southward and will favor the Northern

2:43 Hemisphere into November as it continues its

2:45 long journey out of the solar system.

2:48 Avery: And for those with large telescopes, there's

2:50 an extra special treat interstellar comet

2:52 3I Atlas. Also visible

2:55 as a 11th magnitude object, it'll just look

2:58 like a dot, but it's a rare interloper from

3:01 beyond our solar system. Precise coordinates

3:03 are needed, but sites like Kevin's above

3:06 offer excellent comet pages.

3:08 Anna: Astrophotographer Elliot Herman noted that if

3:10 a comet is three or four, it will be a

3:13 nice binocular object, suggesting apps like

3:16 Stellarium to locate it. Observing Comet

3:19 Asics LEMMON is as easy as sweeping at low

3:21 power, and even a tripod mounted DSLR

3:24 with 10 to 30 second exposures should reveal

3:26 it as a small green blob.

3:28 Avery: That's fantastic advice.

3:30 And speaking of interstellar comets, Anna,

3:32 let's dive deeper into three IAT

3:35 LAs. This object has really

3:38 captured the astronomical spotlight since its

3:40 discovery in July 2025.

3:43 Anna: It's definitely captured a lot of attention.

3:45 To clarify, 3i Atlas is actually the third

3:48 interstellar object ever discovered after

3:51 1eye Oumuamua in 2017 and

3:54 2i Borisov in 2019.

3:56 It was found by the Atlas station in Chile.

3:59 Avery: 3I Atlas, like Borisov,

4:02 is clearly a comet, but it's thought to be

4:04 quite large with a nucleus estimated at about

4:06 a kilometer in diameter, roughly the length

4:09 of 10 football fields.

4:10 Anna: One of its most unusual features is that its

4:12 dust tail appears to point towards the Sun.

4:15 Normally, solar radiation pushes comet tails

4:18 away. 3i Atlas has that

4:21 faint normal tail but also heavier dust

4:24 grains pushed by its own internal activity.

4:27 Avery: Because the Sun's energy increases that

4:30 internal activity, dust is primarily

4:33 pushed out towards the sun, creating this

4:36 backward looking tail. Initial studies

4:38 suggest this comet may be between 3 and

4:41 14 billion years old, potentially older

4:44 than our solar system, an.

4:46 Anna: Ancient relic Tracing its exact galactic

4:49 origin is almost impossible as its

4:51 trajectory has been nudged countless times.

4:54 However, JWST and SphereX

4:57 observations show it's rich in carbon

4:59 dioxide, suggesting it formed far from its

5:02 parent star in a very cold environment.

5:04 Avery: So while we don't know where it came from, we

5:07 do know where it's going. 3i

5:09 Atlas reaches perihelion, its closest point

5:12 to the sun around October 29th.

5:15 Then it will pass 0.65 AU

5:18 from Venus on November 3rd.

5:20 Anna: And here's an exciting ESA's Juice

5:23 spacecraft en route to Jupiter will attempt

5:25 to observe 3i Atlas. Its

5:28 closest approach to Earth will be December

5:30 19th. After passing Jupiter in

5:32 March 2026, it will leave our solar

5:35 system.

5:36 Avery: It's incredibly fast too, at

5:39 perihelion it's expected to hit 68

5:41 kilometers per second. 3 IA

5:44 Atlas certainly won't be the last. With

5:47 powerful survey telescopes like the Vera

5:49 Rubin Observatory coming online,

5:51 astronomers expect to discover many more

5:54 interstellar objects, giving us unique

5:57 insights into the universe from interstellar

6:00 wanderers.

6:00 Anna: Let's turn our attention to the very

6:02 beginning of everything. New research from

6:05 astronomers in Australia suggests that the

6:07 early universe was surprisingly warmer than

6:09 expected, particularly around 800 million

6:12 years after the Big Bang.

6:14 Avery: This discovery specifically probes the epoch

6:16 of reionization. The universe

6:19 originated 13.8 billion years ago.

6:22 Initially, it was a hot soup of particles,

6:26 then cooled enough for hydrogen and helium

6:28 nuclei to form with three electrons,

6:32 making the universe opaque.

6:34 Anna: About 380,000 years after the Big

6:36 Bang, it cooled further, allowing the first

6:39 neutral atoms to form and light could finally

6:42 travel freely, creating the cosmic

6:45 microwave background we observe today.

6:47 Then came the Dark ages. For about 200

6:50 million years, a dark expanse of mostly

6:52 hydrogen.

6:53 Avery: The epoch of reionization ended these

6:56 dark ages when the first stars ignited.

6:59 These early stars emitted ultraviolet light

7:02 energetic enough to ionize the surrounding

7:04 hydrogen gas, clearing the cosmic fog

7:07 and making the universe transparent, allowing

7:10 starlight to eventually reach our telescopes.

7:13 This period is incredibly important because

7:16 it's when the first stars and galaxies

7:18 formed.

7:19 Anna: So what about its temperature? Researchers

7:20 used the Murchison Wide Field Array radio

7:22 telescope, analyzing a decade's worth of data

7:25 from 2013 to 2023. They looked for

7:28 the faint signal of the 21cm

7:31 hydrogen line. From this extremely distant

7:33 epoch, red shifted to longer radio

7:36 wavelengths.

7:37 Avery: The challenge, as Ridima Nun Hoki explained,

7:40 was meticulously cleaning the data to remove

7:42 all the foreground signals, emission from

7:45 closer objects like stars and galaxies,

7:48 interference from Earth's atmosphere, and

7:50 even noise from the telescope itself. It's a

7:53 massive data science undertaking, and.

7:56 Anna: After all that careful work, they didn't find

7:58 the telltale characteristics that would

8:00 indicate a very cold universe. This implies

8:03 the gas between galaxies was heated.

8:06 Catherine Trott noted this rules out very

8:08 cold reionization. A, uh, really interesting

8:10 finding.

8:11 Avery: The new research suggests this warmer early

8:13 universe was heated by x rays from early

8:16 sources, specifically nascent black holes and

8:19 the remains of dead stars. And it helps us

8:22 understand the conditions that allowed light

8:24 to eventually break free.

8:26 Anna: Looking ahead, the team will apply these

8:28 cutting edge data analysis techniques to even

8:31 higher quality data from the Square Kilometer

8:34 Array telescopes currently under construction

8:37 to fine tune our understanding of this

8:40 critical epoch.

8:41 Avery: Moving from the early universe to our own

8:43 star, the Sun. Prepare for a surprising

8:46 revelation. Scientists at the University of

8:49 Hawaii have finally discovered why it appears

8:51 to rain on the Sun. Changing

8:54 elemental makeup, um, drives these mysterious

8:56 downpours of plasma.

8:58 Anna: That's right, Avery. This solar rain

9:01 involves cooler, denser clumps of plasma that

9:03 condense high in the sun's corona and then

9:06 descend back towards the surface. Researchers

9:09 were puzzled by how rapidly this could happen

9:11 during intense solar flares, and.

9:14 Avery: The long standing mystery has been solved by

9:16 Luke Bennevitz, uh, a graduate student, and

9:18 astronomer Jeffrey Reap. Their findings,

9:20 published in the Astrophysical Journal,

9:23 provide an essential update to solar models

9:25 that have puzzled scientists for decades.

9:27 Anna: Bennovitz explained that current models

9:30 assume the distribution of elements in the

9:32 corona is constant, but their work shows

9:35 that when elements like iron are allowed to

9:37 change with time, the models finally match

9:39 what's observed. This means the physics truly

9:42 comes alive and feels real.

9:45 Avery: This is a significant breakthrough. Earlier

9:47 models assumed elemental distributions were

9:50 constant, which didn't match fast acting

9:53 solar flares. This new understanding

9:56 of shifting elemental abundances explains

9:58 how rain can form so quickly. As Arip

10:01 noted, if our models haven't treated

10:04 abundances properly, cooling times were

10:07 likely overestimated, meaning a lot of new

10:09 work is needed on coronal heating.

10:12 Anna: This discovery has implications far beyond

10:14 coronal rain, challenging long standing

10:17 models that assumed fixed elemental

10:18 abundances in the Sun's atmosphere. It

10:21 pushes researchers to rethink how the sun's

10:24 outer layers behave and how energy moves

10:26 through its atmosphere, potentially aiding

10:28 space.

10:29 Avery: Weather prediction that's crucial for our

10:32 technological society.

10:34 Now let's blast off into our launch

10:36 roundup. For the first week of October

10:39 2025, SpaceX is

10:42 absolutely dominating the manifest with

10:44 five Falcon 9 missions scheduled.

10:48 Four of these will launch more satellites

10:50 into their Starlink Internet Constellation,

10:52 and the fifth will carry satellites for

10:54 Amazon's Project Cooper first.

10:56 Starlink Group 1059 lifted off on

10:59 Tuesday, October 7th at 12:10am

11:02 EDT from Cape Canaveral. Its

11:05 Falcon 9 booster B1090

11:07 completed its eighth flight and landed

11:10 successfully just hours later. On Tuesday

11:12 Evening, Starlink Group 1117

11:15 launched from Vandenberg Space Force Base in

11:18 California, carrying another 28

11:21 Starlink V2 mini satellites into low

11:23 Earth orbit. That's a rapid turnaround even

11:26 for SpaceX. Blue Origin also

11:29 joins the schedule with their 36th New

11:32 Shepard mission, planned for Wednesday,

11:33 October 8, carrying six people to

11:36 suborbital space. This marks New

11:39 Shepard's 15th crewed mission and its eighth

11:41 flight this year, doubling their total

11:44 flights from 2024, a significant

11:46 increase. Then on October 9,

11:49 another Falcon 9 will launch the

11:51 KF03 mission for Amazon's Project

11:54 Kuiper sending 24 communications

11:56 satellites into LEO. This adds to the

11:59 12 nine Kuiper satellites already deployed,

12:02 aiming for a total of

12:04 3,336. Booster

12:06 B1091 will be making its second flight with a

12:09 quick 60 day turnaround. Meanwhile,

12:12 in China, CASC is expected to launch

12:15 the fifth Changzang 8A rocket from

12:18 Wencheng, a mission initially delayed by

12:21 Typhoon Makmo. And to cap off SpaceX's

12:24 busy week, two more Starlink missions, Group

12:26 1052 and 1119, are slated

12:29 for October 12th. This will make Falcon

12:32 9's 130th mission of

12:34 2025 and 548th over,

12:38 what, a week for launches?

12:40 Anna: That's an incredible pace, Avery finally

12:42 today, Johns Hopkins astronomers have

12:44 developed a new algorithm that can render

12:46 images from ground based telescopes as clear

12:49 as those taken from space. This

12:51 groundbreaking method uses algorithms to

12:53 strip away atmospheric interference, making

12:56 it possible for earthbound instruments to

12:58 produce the deepest, clearest images.

13:01 Thomas Budavari says it allows us to see

13:03 farther, fainter targets Even the most

13:06 powerful ground based telescopes struggle

13:09 with Earth's atmosphere. Variations in

13:12 temperature, pressure and air conditions

13:14 cause subtle but significant distortions.

13:17 Traditional techniques often blur fine

13:20 details or introduce grainy artifacts.

13:23 The new solution, called ImageMM,

13:26 models how light travels through our restless

13:28 atmosphere, effectively stripping away

13:31 distortions. Yashil Sukhardeep

13:34 described our algorithms learn to see past

13:37 that curtain, reconstructing the still sharp

13:39 image hidden behind it. Early tests

13:42 with images from the Subaru Telescope, one of

13:45 the world's largest, restored blurry and

13:47 noisy images in a matter of seconds,

13:49 revealing intricate spiral galaxy structures

13:52 with unprecedented clarity. These

13:55 images were specifically acquired to test for

13:57 similar quality as future captures by the

13:59 Vera C Rubin Observatory.

14:02 Sukhardeep explained that their framework can

14:04 recover a near perfect image from a series of

14:06 imperfect observations, getting as close as

14:09 possible to ground truth. This is

14:12 critical for astronomers who need to

14:14 accurately measure the shapes of objects.

14:16 While space telescopes offer superior deep

14:19 imaging capabilities, they cover only a tiny

14:22 fraction of the observable sky. Ground

14:25 based facilities like the Rubin Observatory,

14:27 however, will image the entire visible sky

14:30 every few days. With this new technique,

14:32 hundreds of ground based observations can be

14:35 turned into images almost comparable to what

14:37 was previously only achievable with a space

14:39 telescope. This is a massive leap for ground

14:42 based astronomy.

14:43 Avery: What an incredible collection of stories

14:46 today. Ana uh, it's clear the cosmos is

14:48 always full of surprises.

14:50 Anna: It certainly is. Avery and that's all we have

14:52 time for today. Thank you for tuning in to

14:54 Astronomy Daily.

14:55 Avery: Join us tomorrow for more space and astronomy

14:58 news. Until then, keep looking up.