Andrew J. Steinmetz
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ajsteinmetz.com
Andrew J. Steinmetz
@ajsteinmetz.com
1.6K followers 1.2K following 750 posts
Physics PhD, fmr. Global Professor at the University of Arizona. Talks about physics, astronomy and other sciences! (views my own) ⚛️🔭🧪🧮 https://ajsteinmetz.github.io/
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Psst. #Physics peeps. If you irradiate lithium-6 with half MeV deuterium ions, you cause #Fusion of the nuclei into two alpha particles aka helium-4. #Science #NuclearPhysics.
Reposted by Andrew J. Steinmetz
Scientists predominantly use X and LinkedIn for professional scientific networking, but with Bluesky and Mastodon in recent years hoping to break through as alternatives.

https://mikeyoungacademy.dk/communities-of-scientists-are-emerging-on-bluesky/

cc: @davidchavalarias

#helloquittex […]
Original post on piaille.fr
piaille.fr
More Act III posting. Today's juice is The Storm and Buried in the Red! Continue the new songs #Protomen! #Music #RockOpera #ConceptAlbum.
Reposted by Andrew J. Steinmetz
Happy world squid and cuttlefish day!!

Text your friend a squid fact. Watch a video of a cuttlefish doing something cute.
Doodle a squid and then show it to me.

The world is cruel but squid are good.
Second week of new songs for the #Protomen final album Act III: This City Made Us. I've waited like 16 years for this! No Way Back is an absolute banger. #Music #RockOpera #Rock theprotomen.bandcamp.com/album/act-ii...
Reposted by Andrew J. Steinmetz
Do sub-millisecond pulsars exist?

“NO”

Is that’s a way to start a talk!

#Pulsars2025
This is my favorite #Jazz album and my first #Japanese #CD. Flying Beagle, 1987, is by Himiko Kikuchi. The dog's name is Boogie and is absolutely the reason I originally listened to this.
Hmm. 🤔 Enrollment in bachelor's degrees in #Physics seems to have fallen off a cliff in German universities since the pandemic. Anybody know if this trend has reproduced itself in your country or in another STEM field? #EduSky #AcademicSky #Science 🧪⚛️

Source: www.dpg-physik.de/veroeffentli...
TIL that popcorn is an ancient snack with evidence going back to 4,700 BC in Peru via radiocarbon dating. That's potentially older than the potter's wheel! #Science #Archeology #History 🧪

Source: doi.org/10.1073/pnas...
Any the yellow lines represent rays of light (which appear as 45-degree angled lines in Penrose coordinates. As nothing can travel faster than light, this explains why nothing can escape a black hole. If you're inside, you can't move rightward steeper than 45-degrees!
The black hole's event horizon is the red/orange line btw!
Oppenheimer-Snyder collapse (Penrose coordinates) shows how #BlackHoles form with radius (x-axis) & time (y). The star's surface (white) becomes the "antihorizon" of the BH (upper half diamond) with a singularity (cyan). #Physics #Astronomy #Science 🧪🔭⚛️

More info: jila.colorado.edu/~ajsh/bh/col...
Thank you! No, I don't think so.
Excellent ambient from @quietdetails.bsky.social here:
quietdetails.bandcamp.com/album/monolo...

If I were to put it into words, it's wind chimes as you sat in a wooden rocking chair while reading a book on a chilly day.
Monologue, by Aiko Takahashi
7 track album
quietdetails.bandcamp.com
@smartmanapps.dotnet.social.ap.brid.gy Definitely agree that textbooks >> most online sources. I still appreciate Wiki for what it is though and some articles are excellent. @archive.org is awesome. Another good archivist resource is @hathitrust.bsky.social. I've cited their scans of old journals.
@drdrowland.fediscience.org.ap.brid.gy

What specific channels? Off the top of my head, I got @3blue1brown.com's 3Blue1Brown, Minute Physics, Crash Course, PBS Spacetime, PBS Eons, Microcosmos. (I love #PBS)
Reposted by Andrew J. Steinmetz
A close-up video of the young Great Blue #Heron that I'm calling Hairy Floofhead. #birds #wildlife
📌 Just to remind myself anytime somebody brings up how Christian this guy is supposed to be.