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John F Wu

@jwuphysics.bsky.social
4K followers 684 following 1.4K posts

Tenure-track astronomer working on galaxies, machine learning, and AI for scientific discovery. Opinions my own. He/him. Website: jwuphysics.github.io

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John F Wu @jwuphysics.bsky.social · 4h
Amazing! Are you planning on covering (radio) interferometry?
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Bookshop.org @bookshop.org · 06/10/2026
Anti-Prime Day starts…NOW! 🥳 Today through midnight on 10/7, enjoy free shipping site-wide, all while supporting local, independent bookstores.
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John F Wu @jwuphysics.bsky.social · 06/10/2026
Babe new math breakthrough just dropped
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John F Wu @jwuphysics.bsky.social · 04/10/2026
Baltimore is just such an incredible city, it's crazy how big the chasm is in sentiment between actual Baltimore residents vs people who live in the suburbs
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Mark Riedl @markriedl.bsky.social · 03/10/2026
Screw-ups should be costly. There should be a high government fine on top of it, plus paying to clean-up and re-secure the systems hacked. These are equivalent to industrial accidents and should be treated as such, imo
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John F Wu @jwuphysics.bsky.social · 03/10/2026
Life imitates a̶r̶t̶ Schmidhuber
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Julia Métraux @juliametraux.bsky.social · 02/10/2026
"I'm supposed to be a tough guy," Curtis confided. "I can hold your hand," the mayor offered "What happens if I faint?" Sliwa asked. "I've got you," Mamdani assured him, grabbing his hand as Sliwa received his flu shot. abc7ny.com/post/nyc-may...
abc7ny.com
Mayor Mamdani holds hands with one-time rival Curtis Sliwa to get flu shot
An apparent bromance has continued to blossom for the one-time political rivals.
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John F Wu @jwuphysics.bsky.social · 02/10/2026
You can do it yourself by dragging the A_V handle around in this view: galaxy-manifold.github.io#f=AAAAAG0bAA...
galaxy-manifold.github.io
Galaxy Manifold
Galaxy scaling relations as rotating projections of a high-dimensional manifold of SDSS galaxy properties.
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John F Wu @jwuphysics.bsky.social · 02/10/2026
I can't stop it's too much fun
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John F Wu @jwuphysics.bsky.social · 02/10/2026
By popular demand, I wrote a blog post explaining the web app that I built last week: the Galaxy Manifold. jwuphysics.github.io/blog/2026-10...
A preview of the Galaxy Manifold page at https://galaxy-manifold.github.io, showing the SFR-stellar mass correlation with galaxy image cutouts on a grid.
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John F Wu @jwuphysics.bsky.social · 02/10/2026
I don't have to imagine what LinkedIn slop would've looked like in the 90s, we already had Chicken Soup for the Soul
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John F Wu @jwuphysics.bsky.social · 02/10/2026
And yeah the first version of this I played was in China with my cousin, no idea what we called it though
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John F Wu @jwuphysics.bsky.social · 02/10/2026
I've played so much of this and have heard all the names except Capitalism lol
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Ned Resnikoff @resnikoff.bsky.social · 29/09/2026
I think about this interview with the distinguished philosopher Conan O'Brien a lot. I actually think this is a healthy way to live your life! www.nytimes.com/2019/01/14/a...
Is this how you want to go out, with a show that gets smaller and smaller until it’s gone?

Maybe that’s O.K. I think you have more of a problem with that than I do. [Laughs.] At this point in my career, I could go out with a grand, 21-gun salute, and climb into a rocket and the entire Supreme Court walks out and they jointly press a button, I’m shot up into the air and there’s an explosion and it’s orange and it spells, “Good night and God love.” In this culture? Two years later, it’s going to be, who’s Conan? This is going to sound grim, but eventually, all our graves go unattended.

You’re right, that does sound grim.

Sorry. Calvin Coolidge was a pretty popular president. I’ve been to his grave in Vermont. It has the presidential seal on it. Nobody was there. And by the way, I’m the only late-night host that has been to Calvin Coolidge’s grave. I think that’s what separates me from the other hosts.

I had a great conversation with Albert Brooks once. When I met him for the first time, I was kind of stammering. I said, you make movies, they live on forever. I just do these late-night shows, they get lost, they’re never seen again and who cares? And he looked at me and he said, [Albert Brooks voice] “What are you talking about? None of it matters.” None of it matters? “No, that’s the secret. In 1940, people said Clark Gable is the face of the 20th Century. Who [expletive] thinks about Clark Gable? It doesn’t matter. You’ll be forgotten. I’ll be forgotten. We’ll all be forgotten.” It’s so funny because you’d think that would depress me. I was walking on air after that.
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John F Wu @jwuphysics.bsky.social · 01/10/2026
Important thread. Potential TW (SA)
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John F Wu @jwuphysics.bsky.social · 30/09/2026
My daughter's school sent me a URL-shortened link to an "apptegy.me" page containing a link to a flyer, which is a Canva space, which tells me that there is a parent information session TOMORROW AT 4PM, and contains another URL-redirect link to the virtual meeting. Guys I wish I were making this up
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John F Wu @jwuphysics.bsky.social · 30/09/2026
Ah, what if we changed the selection criteria? It would only alter a few of the targets. There's more than 7 hours left before the deadline!
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NSF-Simons AI Institute for Cosmic Origins (CosmicAI) @nsfsimonscosmicai.bsky.social · 30/09/2026
@aas.org Special Session - Advances in Foundation Models and Agentic AI for Astronomy January 13th, 2027 Salt Lake City Speakers: Francisco Villaescusa-Navarro Mike Smith Rachel Mandelbaum Eytan Adar cosmicai.org/events/aas-a...
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John F Wu @jwuphysics.bsky.social · 29/09/2026
Angry at how true this is Alad, a good password manager + 2FA system will only partially restore sanity
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Andrew Schreck @andrewschreck.bsky.social · 28/09/2026
i don't think cis guys realize how much power they can shift in a conversation just by casually telling their friends
"that's fucked up, man" when someone says something
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Mike Masnick @masnick.com · 25/09/2026
So this story won't receive much attention, but... is kind of a big deal? It sure looks like the plaintiffs lawyers in the big copyright case against OpenAI/Microsoft did some seriously sketchy shit to manufacture evidence and sneak it into the case....
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John F Wu @jwuphysics.bsky.social · 27/09/2026
gonna assume that autocorrect is responsible for "oat milk barista edition"
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John F Wu @jwuphysics.bsky.social · 26/09/2026
Thanks for the heads up. I tried a possible fix, but I'm not sure it'll work -- there are a few candidate reasons why iPhone and android might respond differently to short presses, so let's see if this lightweight solution fixes it....
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John F Wu @jwuphysics.bsky.social · 26/09/2026
Are you on mobile? For me (Android/Firefox) a short tap will select the shown scaling relation (and change the data manifold projection), but a long press will show the mini pop up. I have seen some lagginess at times... wasn't able to replicate an off-by-one error though!
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John F Wu @jwuphysics.bsky.social · 26/09/2026
Thank you! If there are any ways you think it could be improved, then please let me know!
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John F Wu @jwuphysics.bsky.social · 25/09/2026
By popular demand: you can now filter out galaxies colored by missing values! In this case, I'm showing sSFR vs Mstar, colored [and filtered] by HI/Mstar. galaxy-manifold.github.io#p=ssfr&c=log... (Also, this is what it looks like on a desktop, not mobile.)
A computer-based browser view of galaxies in the specific SFR against stellar mass relation, colored by gas richness from blue (most gas-rich) to red (most gas-poor). It shows a smattering of points along the sequence of star-forming galaxies, and then a second small population of red-sequence galaxies at low sSFRs. There are very few at the bottom here because they are generally gas poor, and have thus been filtered out using the new capability on the web app.
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John F Wu @jwuphysics.bsky.social · 25/09/2026
Thanks Robel! Feedback always welcome :)
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John F Wu @jwuphysics.bsky.social · 25/09/2026
I'm also noticing that I butchered the #astrosky tag on my first post. Yay for fat fingers :)
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John F Wu @jwuphysics.bsky.social · 25/09/2026
By popular demand: you can now filter out galaxies colored by missing values! In this case, I'm showing sSFR vs Mstar, colored [and filtered] by HI/Mstar. galaxy-manifold.github.io#p=ssfr&c=log... (Also, this is what it looks like on a desktop, not mobile.)
A computer-based browser view of galaxies in the specific SFR against stellar mass relation, colored by gas richness from blue (most gas-rich) to red (most gas-poor). It shows a smattering of points along the sequence of star-forming galaxies, and then a second small population of red-sequence galaxies at low sSFRs. There are very few at the bottom here because they are generally gas poor, and have thus been filtered out using the new capability on the web app.
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John F Wu @jwuphysics.bsky.social · 25/09/2026
Built a thing that #aatrosky may enjoy: galaxy-manifold.github.io
The galaxy SFR - stellar mass sequence shown on a phone screen, with galaxy image cutouts as well as lines showing the relation for galaxies based on subselections in Dn4000 break strength. All from the web app.
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John F Wu @jwuphysics.bsky.social · 24/09/2026
Ah, thank you for clarifying!
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John F Wu @jwuphysics.bsky.social · 24/09/2026
This is beyond stupid and even boosters know AI should not be used to review like this @ukri.org
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justine zhang @tisjune.bsky.social · 24/09/2026
they're saying the AI can do math and science again, so it's time to reread Thurston's On Proof and Progress in Mathematics, a lovely articulation of the social work of assembling understanding, i.e., the best reason to tackle hard problems. www.ams.org/journals/bul...
When I started as a graduate student at Berkeley, I had trouble imagining
how I could "prove" a new and interesting mathematical theorem. I didn't
really understand what a "proof was.
By going to seminars, reading papers, and talking to other graduate students,
I gradually began to catch on. Within any field, there are certain theorems and
certain techniques that are generally known and generally accepted. When you
write a paper, you refer to these without proof. You look at other papers in the
field, and you see what facts they quote without proof, and what they cite in
their bibliography. You learn from other people some idea of the proofs. Then
you're free to quote the same theorem and cite the same citations. You don't
necessarily have to read the full papers or books that are in your bibliography.
Many of the things that are generally known are things for which there may be
no known written source. As long as people in the field are comfortable that
the idea works, it doesn't need to have a formal written source.At first I was highly suspicious of this process. I would doubt whether a certain idea was really established. But I found that I could ask people, and they
could produce explanations and proofs, or else refer me to other people or to
written sources that would give explanations and proofs. There were published
theorems that were generally known to be false, or where the proofs were generally known to be incomplete. Mathematical knowledge and understanding were
embedded in the minds and in the social fabric of the community of people
thinking about a particular topic. This knowledge was supported by written
documents, but the written documents were not really primary.
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John F Wu @jwuphysics.bsky.social · 24/09/2026
100% this
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Dr. Jessie Christiansen @aussiastronomer.bsky.social · 23/09/2026
Congrats to the whole PRIMA team on the selection of NASA's first Probe Explorer mission!!!!!! @caltechipac.bsky.social will be PRIMA's science center, and we look forward to working with everyone over the next decade on this exciting project! www.nasa.gov/news-release...
nasa.gov
NASA Selects Far-Infrared Telescope as First in New Mission Class - NASA
NASA announced Wednesday a mission to explore the history and evolution of the universe, PRIMA (PRobe far-Infrared Mission for Astrophysics), is advancing to
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John F Wu @jwuphysics.bsky.social · 21/09/2026
I like the idea of self-ranking (arxiv.org/abs/2206.08149), but ultimately I think you simply need to impose caps on the number of submissions.
arxiv.org
You Are the Best Reviewer of Your Own Papers: The Isotonic Mechanism
Machine learning (ML) and artificial intelligence (AI) conferences including NeurIPS and ICML have experienced a significant decline in peer review quality in recent years. To address this growing cha...
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John F Wu @jwuphysics.bsky.social · 21/09/2026
Fantastic work as always! #astrosky
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John F Wu @jwuphysics.bsky.social · 20/09/2026
Same old ravens eh
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John F Wu @jwuphysics.bsky.social · 16/09/2026
A very respectful way for the editor to say that these authors are utterly wasting everybody's time and are destroying trust that holds our research community together
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Gautam Kamath @gautamkamath.com · 16/09/2026
Nihar Shah did a heroic experiment for TMLR: he spent 20-25 hours over two weeks interviewing authors of seemingly low-quality submissions about their own papers. He confirmed what we all suspected: people submitting these papers have *no idea* what is going on in them.
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Transactions on Machine Learning Research @tmlrorg.bsky.social · 16/09/2026
TMLR has faced a deluge of submissions, necessitating stricter desk rejection policies due to limited reviewer capacity Co-EiC Nihar Shah reached out to authors of 10 papers slated for desk reject. Could they answer questions about their *own* submission? medium.com/@TmlrOrg/ask...
medium.com
Asking Authors About Their Own Papers
By Nihar B. Shah
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Ethan Mollick @emollick.bsky.social · 16/09/2026
The state of public AI benchmarking is dire and is undermining our ability to understand how good AI is now Most famous measures are maxed out, and, as this paper shows, the non-saturated benchmarks are riddled with so many errors that they vastly underestimate AI abilities arxiv.org/abs/2609.13009
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Matthew Kenerly @mattk-fs.bsky.social · 14/09/2026
For the Baitmore Bluesky folks: If you like the idea of volunteering a couple hours of your time in exchange for multiple free beers, then do I have the event for you.
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Matt Henderson @matthen.com · 14/09/2026
chaos from bouncing a ball in a circle- at each point, I simulate a bunch of futures with slightly different velocities- showing how predictable the system would be with measurement error. The system seems to move between Stable Eras and Chaotic Eras, where it is hard to predict four bounces ahead
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John F Wu @jwuphysics.bsky.social · 13/09/2026
Hopefully we'll see jazz hands r lewis again
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John F Wu @jwuphysics.bsky.social · 13/09/2026
Smol Lamar
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John F Wu @jwuphysics.bsky.social · 13/09/2026
RO!!!
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John F Wu @jwuphysics.bsky.social · 13/09/2026
If only we had childcare then I would've loved to attend! Brings back memories of my time in Cape Town. Seemed like an awesome game, too!
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Michael Clemens @mclem.org · 12/09/2026
The US President's new proposal to tax international students has been approved by the White House for release this week. It's an unprecedented $100,000 tax on int'l grads who stay to work after graduation on Optional Practical Training (most grads do), a crucial bridge to remaining by any channel.
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John F Wu @jwuphysics.bsky.social · 10/09/2026
Heads up: the 4th Workshop on Artificial Intelligence for Scientific Publications, spearheaded by ADS will be on Nov 9, 2026. It's still accepting submissions -- see the website here: ui.adsabs.harvard.edu/WIESP/2026/
ui.adsabs.harvard.edu
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