Launch Day for Swift's Rescue, ISS Spacewalk, and Unraveling the Secrets of the Cosmos

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Anna: Good morning and welcome to Astronomy Daily.

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I'm Anna.

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Avery: And I'm avery. It's Tuesday, June

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30, 2026, and today is

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launch day.

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Anna: After weeks of watching this story build, we

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finally get to say it. A rescue mission for

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NASA's Swift observatory is heading to the

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launch pad, or rather the launch aircraft

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today.

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Avery: Plus a spacewalk happening live on the iss.

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A galaxy cluster that's breaking cosmology's

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rulebook. A quiet nursery hidden in the most

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violent part of our galaxy. A newly

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confirmed fossil galaxy near Andromeda. And

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why today is Asteroid Day.

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Anna: Vic stories one very busy Tuesday.

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Let's get into it.

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We've been tracking this one for weeks. And

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Today's the day NASA's Neil Gerald

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Swift, observatory, 22 years old, still

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hunting gamma ray bursts, has been losing

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altitude faster than expected thanks to solar

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activity.

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Avery: Without help, Swift faced a real chance of an

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uncontrolled re entry by the end of this

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year. So NASA contracted a m small

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Arizona company, Catalyst Space Technologies,

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to build a robotic rescue spacecraft called

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Link in under nine months, a job that

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would normally take two years.

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Anna: Link is about the size of a, uh, fridge.

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Three robotic arms, lidar sensors, ion

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thrusters. Today it launches from Kwadrilin

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Atoll in the Marshall Islands. Carried under

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the belly of Stargazer, the last aircraft

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worthy Lockheed, Lockheed Tristar in the

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world been dropped and lit on a Northrop

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Grumman Pegasus xl, the very last

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Pegasus XL ever to fly.

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Avery: Launch window opened at 6:23am Eastern.

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That's this evening here in Australia. As of

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our recording, NASA and Northrop Grumman have

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the mission status listed as go.

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Anna: If it works, Link will spend months gently

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grappling and nudging Swift back up to a safe

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altitude. Swift was never built for being

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serviced. No docking port, no handholds.

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So this will be delicate historic work.

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Avery: Rat Kranko, the Swift principal Investigator

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at Goddard, put it Simply. Swift is

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NASA's multi tool for studying the cosmos.

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Today we find out if that multitool gets a

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second life.

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Anna: Fingers crossed for a clean release and a

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good first signal from Link. We'll keep you

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posted as uh, this story develops.

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Avery: Story two takes us to the International Space

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Station, where NASA astronauts Chris Williams

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and Jessica Meir are stepping outside today

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to fix a wrist joint on KANADRM2.

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Anna: KANADRM2 is the station's big robotic

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arm. It's been doing the heavy lifting,

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literally since 2001. Capturing

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cargo ships, repositioning modules, helping

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with spacewalks. But one of its wrist joints

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has been giving controllers trouble.

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Avery: The spacewalk kicked off at around 8:35am

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Eastern today. Williams and Meir will

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replace the faulty joint mechanism so the arm

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can keep operating with its full range of

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motion.

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Anna: It's not the flashiest of stories, but it

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matters enormously. Without a fully

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functioning Canat Arm 2, a lot of station

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operations get a lot harder, from cargo

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capture to external

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Avery: maintenance routine, and the sense that NASA

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has done dozens of these repairs over the

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decades. But every spacewalk still carries

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real risk, and this crew is doing

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precise, fiddly work in a pressurized

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suit 400km up.

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Good luck to them.

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Anna: Story three is a genuine cosmological

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puzzle. A team led by Kyle Finner at

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Caltech's IPEC has used the James Webb

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Space Telescope to study a, uh, galaxy

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cluster called

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XLSSC122.

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Avery: That distance puts it in an era astronomers

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call cosmic noon, when the universe was only

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about 3 billion years old and forming stars

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faster than at any point before or since.

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Galaxy clusters from that era are supposed to

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look young, loose, scattered, still pulling

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themselves together.

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Anna: XLSSC122 doesn't

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look like that. JWST caught it acting

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as a gravitational lens, bending the light of

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background galaxies into arcs, and it's now

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the most distant, strong lensing galaxy

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cluster ever found.

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Avery: When the team measured how concentrated the

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cluster's core mass is, the number

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came back higher than current cosmological

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models say it should be allowed to be. The

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visible matter stars gas barely

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accounts for any of it. The rest is

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dark matter, packed in tighter than expected

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for something this early in cosmic history.

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Anna: Laid researcher Fenner was refreshingly

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honest about it. This could just be one

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extreme outlier in a normal distribution.

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Or it could be a sign that something in our

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models of how structure formed in the early

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universe needs revising.

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Avery: Either way, it's a reminder of just how much

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JWST is rewriting the early chapters of

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cosmic history, one impossibly

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mature galaxy cluster at a time. From

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the very distant universe to our own

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backyard, the center of the Milky Way is one

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of the most violent neighborhoods in the

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galaxy, a churning storm of gas moving

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faster than the speed of sound. It's about

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the last place you'd expect to find a star

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quietly being born.

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Anna: And yet astronomers using the ALMA telescope

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array in Chile have mapped that chaos in

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detail and found exactly that a

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small, almost accidental pocket where the

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turbulent gas slows down, slowly settles, and

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begins gathering itself into the seeds of new

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stars.

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Avery: It's a small, almost accidental discovery

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with big implications. It suggests that

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stars might take their very first steps the

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same way everywhere in the galaxy, even in

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the most hostile environments imaginable.

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Anna: And that includes very possibly our own

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Sun. Billions of years ago, the sun may well

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have condensed out of just this kind of brief

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island of stillness somewhere in the swirling

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chaos of a young turbulent galaxy.

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Avery: A nice thought for your next coffee break.

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Somewhere in that storm at the galactic

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center right now, the next generation of

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stars may already be quietly getting started.

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Anna: Dory 5 is a lovely one. Equal parts

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cosmology and citizen science.

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Astronomers have just formally confirmed in

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the peer reviewed journal Astronomy and

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Astrophysics the discovery of Andromeda

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36, an ultra faint dwarf galaxy

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orbiting our giant neighbor, the Andromeda

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Galaxy.

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Avery: This one was actually first spotted back in

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March by an amateur astronomer, Giuseppe

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Donatellio, visually combing through public

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survey images. Not an algorithm, a person

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scanning pictures by eye. Now, after

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follow up observations with the Gran

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Telescopio Canaris, the team has nailed down

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the details.

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Anna: And what details? Andromeda 36th

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is roughly 12.5 billion years old,

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extremely metal poor, and one of the

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faintest, most compact dwarf satellites

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ever found around Andro. It's essentially a

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fossil from the universe's earliest stages.

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Avery: Astronomers think Andromeda did host close to

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a hundred of these tiny dwarf satellites, and

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only about half are currently known. Lead

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author Joanna Sakova made the point that even

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now, careful visual inspection by a trained

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eye is still finding things that automated

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machine learning searches miss.

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Anna: A nice reminder that in astronomy, sometimes

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the best discovery tool is still a patient

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human looking closely at the data.

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Avery: And finally today, June 30th is asteroid

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day. It's a UN sanctioned day of awareness

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around planetary defense. And the date isn't

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random.

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Anna: It marks the anniversary of the Tunguska

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event back in 1908, when an asteroid or

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comet fragment exploded in the atmosphere

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over Siberia, flattening more than 2,000

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square kilometers of forest. No crater,

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no warning. And to this day, it's the largest

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impact event in recorded history.

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Avery: Asteroid Day exists to make sure we don't

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have to learn that lesson the hard way again.

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Around the world today, observatories, space

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agencies and science communicators are

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running events on planetary defense, tracking

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near Earth objects, deflection technology,

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and what we'd actually do if something was

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heading our way.

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Anna: And we do have a real success story to point

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to. NASA's DART mission already proved

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by physically slamming into the asteroid

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Dimorphos that we can measurably change an

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asteroid's path. It's no longer just theory.

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Avery: So today's less about any single new

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discovery and, uh, more about the bigger

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picture. Thousands of astronomers, amateur

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and professional, quietly doing the

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unglamorous work of mapping the sky for the

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next Tunguska so that if it ever comes,

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we'll see it coming. And that wraps up a

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big Tuesday for Astronomy Daily. A rescue

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mission lighting up the Pacific sky, a

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spacewalk on the iss, and galaxies both

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impossibly old and impossibly young.

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Anna: If you enjoyed today's episode, please hit

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subscribe wherever you're listening and leave

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us a review. It genuinely helps new listeners

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find the show.

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Avery: We're Anna, uh, and Avery. This has been

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Astronomy Daily, and we'll see you back here

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tomorrow. Clear skies, everyone. And good

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luck to Swift and Link tonight.

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Mhm.

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Anna: The stories.

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Avery: Were told.