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Corey S. Powell

@coreyspowell.bsky.social

8.6K followers 910 following 1.5K posts

Fascinated by things very big, very small, and beyond the limits of the human senses. Founder of OpenMind: www.openmindmag.org Creator of the Invisible Universe column: https://invisibleuniverse.substack.com/

invisibleuniverse.substack.com

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Corey S. Powell @coreyspowell.bsky.social · Nov 15

In honor of all the new arrivals, I'm sharing one of my favorite videos.

It shows 24 hours of Earth's rotation, with the camera locked to the sky instead of the ground. We're all hanging out on this spinning rock.

Brilliant work by Bartosz Wojczyński. 🧪

artuniverse.eu/gallery/1907...

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Corey S. Powell @coreyspowell.bsky.social · 6h

In theory, a low mass black hole can explode due to Hawking radiation. It's unproven, and also depends on the unproven existence of low mass bkack holes.

Corey S. Powell @coreyspowell.bsky.social · 12h

It's easy to laugh, but I honestly forget sometimes:

Did I used to wait for press releases in the mail?
Did I call university switchboards to track down researchers?
Did I search for working payphones and call memorized phone numbers?

(I know I did, and yet...)

bleary @bleary.off-the-records.com · 15h

If anyone needs me I will be in the museum, lying down next to the bog bodies.

Did people really memorize phone numbers before cell phones, or is that just a movie thing?
2? Questions
I was watching some old shows from the 90s and noticed people would just dial numbers from memory - like they'd call their friends or family without looking anything up.
Made me wonder if that was actually normal back then? Did people genuinely have all their important numbers memorized, or did most folks keep a little address book or written list nearby?

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Corey S. Powell @coreyspowell.bsky.social · 12h

Neutrino detectors discovering previously unknown rhythms of bioluminescent organisms deep in the Mediterranean!

www.nature.com/articles/sre...

Client Challenge

www.nature.com

Corey S. Powell @coreyspowell.bsky.social · 12h

You can read all about the amazing new Kilometer-Cube Neutrino Telescope (KM3NeT), located deep in the Mediterranean Sea, at the link below.

We can now see *neutrinos*, people! 🧪

www.km3net.org/km3-230213a/...

One module of KM3NeT with 31 light sensitive ‘eyes’ (called photomultiplier tubes) in the deep sea. The observatory which detected the ultra-high energy event (called KM3NeT/ARCA) had 378 of such modules installed at the time of the detection, on a total of 21 vertical detection lines attached to the sea bottom. The lines are at almost 100 meters distance from one another, and are almost 700 meters long. Altogether being a huge network of light sensitive ‘eyes’.
Courtesy KM3NeT.

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Corey S. Powell @coreyspowell.bsky.social · 12h

An ultra-high-energy neutrino spotted by a detector in the Mediterranean Sea could be the result of an exploding black hole.

This is a highly speculative interpretation--but exactly the kind of far-out exploration made possible by new neutrino experiments. 🧪🔭

news.mit.edu/2025/could-p...

A simulation depicts a new high-energy neutrino’s detection by sensor strings rising from the Mediterranean seabed.

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Corey S. Powell @coreyspowell.bsky.social · 1d

"The answer to the Great Question..."
"Yes!"
"Of how to follow up with someone you met in a bar..."
"Yes!"
"Is 'U Up?'" said Deep Thought, with infinite majesty and calm.

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Corey S. Powell @coreyspowell.bsky.social · 2d

Crazy but true: This is a real image captured by the Cassini spacecraft.

Jason Major @jpmajor.bsky.social · 2d

Dione in front of Saturn, captured by Cassini 20 years ago today on October 11, 2005 🌖🪐

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Reposted by Corey S. Powell

Robert “The Bobby Yaga” McNees @mcnees.bsky.social · 2d

“Why is the night sky dark, if we live in an infinite universe?”

Kepler, Halley, and Cheseaux all pondered this apparent paradox, but the question is commonly attributed to Heinrich Olbers, who was born #OTD in 1758. 🧪 🔭

Images: hyperphysics.phy-astr.gsu.edu/hbase/Astro/..., Wellcome Collection

A diagram shows arrows radiating from a central point, indicating directions, with lots of white disks (stars) surrounding the central point.

An etching of Hans Olbers. He wears a heavy coat, vest, and high collared white shirt. His wispy hair is receding.

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Corey S. Powell @coreyspowell.bsky.social · 2d

This finding comes from the archives of a different project called RadioAstron. It was a collaboration with Russia, back in somewhat more peaceful times.

science.nrao.edu/about/news/r...

RadioAstron Operational

science.nrao.edu

Corey S. Powell @coreyspowell.bsky.social · 2d

For those who want to go deeeep:

The full paper about the binary, orbiting supermassive black holes is freely available:

iopscience.iop.org/article/10.3...

The image of OJ 287 at the record-breaking resolution of 12 μas, achieved in space VLBI when the RadioAstron telescope was 15 Earth diameters away from the ground-based telescopes (a distance of about 190,000 km, comparable to about half of the semimajor axis of the Moon orbit).

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Corey S. Powell @coreyspowell.bsky.social · 2d

Sure it's blobby, but this is our clearest look at two supermassive black holes in orbit around each other. The primary one is 18 billion times the mass of the Sun!

The image was created using a space-based antenna that created a combined telescope 190,000 km wide. 🔭🧪

www.utu.fi/en/news/pres...

Two black holes in orbit around each other in quasar OJ287. On the left is part of an image taken by the system including the RadioAstron satellite (J.L. Gomez and et al., 2022), where the two lower bright spots are the radio emission coming from the two black holes, and the topmost spot is the jet of the smaller black hole. On the right is a theoretical diagram, calculated by Lankeswar Dey, showing where the black holes and the jets emanating from them were at the time when the picture was taken.

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Corey S. Powell @coreyspowell.bsky.social · 3d

There should be a whole category for ramen, microwave burritos, and hot pockets

Corey S. Powell @coreyspowell.bsky.social · 3d

The dark mass appears to be an extended object, so not a black hole. It could possibly be a dwarf galaxy, though it would have to be an unusual one that is almost completely starless.

www.nature.com/articles/s41...

A million-solar-mass object detected at a cosmological distance using gravitational imaging - Nature Astronomy

Perturbations to strongly lensed galaxy light in very long baseline interferometric imaging reveal a dark and unusually low-mass object at redshift z ≈ 0.9.

www.nature.com

Corey S. Powell @coreyspowell.bsky.social · 4d

Lennon's piano demo of Real Love is the one that really kills me.

youtu.be/HlX46w8cNXw?...

Real Love - John Lennon (1979 demo) [Remasted 2023]

YouTube video by KR

youtu.be

Corey S. Powell @coreyspowell.bsky.social · 4d

Very true. And there are a number of enablers within the Jewish community who go along with this idea (as I know only too well, being related to some of them).

Corey S. Powell @coreyspowell.bsky.social · 4d

An intriguing detail about the asteroid Kamoʻoalewa:

Based on its orbit and composition, some planetary scientists have theorized that it could be a chunk of our Moon that was blasted free by a large impact. We'll know more soon! 🧪🔭

news.arizona.edu/news/researc...

By using the NASA's JPL — Small-body Database Lookup, the orbit of 469219 Kamo'oalewa can be displayed alongside Earth's orbit. The orbits appear to be nearly identical but just shifted. In the bottom-left corner it provides the distance from Kamo'oalewa to Earth and to the Sun. Credit: NASA

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Corey S. Powell @coreyspowell.bsky.social · 4d

China's Tianwen-2 is on its way to Kamoʻoalewa, an asteroid that currently doubles as a "quasi-moon" of Earth. The spacecraft will collect samples & bring them back home.

On its outward trajectory, Tianwen-2 looked back and got this lovely view of our planet. 🧪🔭

english.news.cn/20251001/ef3...

This image released by the China National Space Administration (CNSA) on Oct. 1, 2025 shows a view of the Tianwen-2 probe alongside Earth, captured by the probe during its deep-space journey. The newly released image, acquired by a monitoring camera mounted on the probe's robotic arm, showcases China's five-starred red flag and the white return capsule against the backdrop of a distant, blue Earth. (Some slight image processing by me.)

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Corey S. Powell @coreyspowell.bsky.social · 4d

Sure, let's award prizes to the Bunsen burners, Erlenmeyer flasks, and of course the inanimate carbon rods...

It's getting harder and harder to separate satire from bad AI takes

Homer Simpson's inanimate carbon rod gets its day of honor

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Corey S. Powell @coreyspowell.bsky.social · 4d

Vote Blob 2028

Corey S. Powell @coreyspowell.bsky.social · 4d

1 word? Halos.

It could tell us how dark matter forms clumpy structures in the halos that seem to surround visible galaxies. Which in turn could provide some clues about what the hell dark matter even is.

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Corey S. Powell @coreyspowell.bsky.social · 4d

In that case you'll definitely enjoy the "is it a banana or is it a penguin?" galaxy.

esahubble.org/images/heic1...

This image shows the two galaxies interacting. NGC 2936, once a standard spiral galaxy, and NGC 2937, a smaller elliptical, bear a striking resemblance to a penguin guarding its egg. This image is a combination of visible and infrared light, created from data gathered by the NASA/ESA Hubble Space Telescope Wide Field Planetary Camera 3 (WFC3).

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Corey S. Powell @coreyspowell.bsky.social · 4d

Astronomers have detected a dark blob of...something, billions of light years away. It's as massive as a million Suns & it emits no detectable radiation.

It might be a clump of dark matter, revealing new details about the structure of the invisible universe. 🧪🔭

www.ucdavis.edu/news/astrono...

Left, our best surface brightness model of the 1.7-GHz global VLBI observation used here, which has been reconvolved with the main lobe of the interferometer’s point spread function and added to the residuals (34 μJy per beam r.m.s.). For reference, red contours show the surface brightness at 2.1 μm observed by the W. M. Keck Observatory adaptive optics system30. The positions of two low-mass perturbers are each marked with a black X. The 2 × 108 M⊙ object first detected by ref. 24 is labelled , and the 1.13 × 106 M⊙ detection reported here is labelled . The zoomed-in region shown in the right-hand two panels is indicated by the black square, which has a side length of 60 mas. Top right, detail of the bright arc around , with the colour scale modified to emphasize the gap in the arc produced by the gravitational perturbation of . Bottom right, GI corrections to the lensing convergence (expressed in units of lens-plane surface mass density), showing a compact, positive feature whose position and mass are consistent with the independent parametric modelling results for . The dashed black circle has a radius of 80 pc and the lensed emission is indicated by the black contours.

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Corey S. Powell @coreyspowell.bsky.social · 4d

For those wondering, here's the full interview:

www.npr.org/transcripts/...

David Simon, Creator Of The Wire, On AI, Television and the WGA Strike : Consider This from NPR

The Hollywood writers' strike has meant three weeks of late-night comedy and soap opera reruns for television fans. And for some fans, it might feel familiar. 15 years ago a Writers Guild strike laste...

www.npr.org

Corey S. Powell @coreyspowell.bsky.social · 5d

Photo from Toronto, more than a decade ago, but I appreciate the joke

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Corey S. Powell @coreyspowell.bsky.social · 5d

What's out there in the universe? We don't know until we look.

The COWLS project scanned 42,000 galaxies and found hundreds of previously unknown gravitational lenses -- places where the pull of massive galaxies has warped space & bent starlight into arcs and rings. 🧪🔭

esawebb.org/images/potm2...

This ESA/Webb Picture of the Month shows eight stunning examples of gravitational lensing. Gravitational lensing, which was first predicted by Einstein, occurs because massive objects like galaxies and clusters of galaxies dramatically warp the fabric of spacetime. When a massive foreground object lines up just so with a background galaxy, the light from the background galaxy bends as it navigates the warped spacetime on its way to our telescopes.

Depending on how perfect the alignment is, the light from the background galaxy can be bent into an arc, a circle (a phenomenon called an ‘Einstein ring’) or even split into multiple images.

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