Andrew J. Steinmetz
@ajsteinmetz.com
Physics PhD, Academic Professional at #GeorgiaTech, fmr. Global Professor at the University of Arizona. I love ⚛️ physics, 🌌astronomy and all 🧪 sciences! (views my own) https://ajsteinmetz.github.io/
We got to the final listed track, track 15 "The Fate of Thomas Light" and it's the saddest bit of music I've listened to in awhile. Everybody in the Bandcamp livestream was devastated. This can't be the end of Act III. #Protomen #Music #RockOpera
December 6, 2025 at 4:37 AM
We got to the final listed track, track 15 "The Fate of Thomas Light" and it's the saddest bit of music I've listened to in awhile. Everybody in the Bandcamp livestream was devastated. This can't be the end of Act III. #Protomen #Music #RockOpera
December 2, 2025 at 3:44 PM
I love #Quasars! This is 3C 273, brightest in the sky, by #HST #Hubble, 2.5 billion light-years away. The bottom blocks out the supermassive #BlackHole showing more detail. The "L" is a jet, possibly from a disrupted dwarf galaxy. #Science #Astronomy #Space.
See: esahubble.org/images/opo24...
See: esahubble.org/images/opo24...
November 21, 2025 at 11:24 PM
I love #Quasars! This is 3C 273, brightest in the sky, by #HST #Hubble, 2.5 billion light-years away. The bottom blocks out the supermassive #BlackHole showing more detail. The "L" is a jet, possibly from a disrupted dwarf galaxy. #Science #Astronomy #Space.
See: esahubble.org/images/opo24...
See: esahubble.org/images/opo24...
This week's Act III #Protomen is "The Dream." Amazing call back to Act III and it's cool to hear Emily again in the story, even only as a memory. #Music #ConceptAlbum #RockOpera.
We're getting to the endgame now.
We're getting to the endgame now.
November 21, 2025 at 1:00 AM
This week's Act III #Protomen is "The Dream." Amazing call back to Act III and it's cool to hear Emily again in the story, even only as a memory. #Music #ConceptAlbum #RockOpera.
We're getting to the endgame now.
We're getting to the endgame now.
I missed last week's #Protomen Act III drop. Last week was “The Redline” + “A Show Of Force” #Music #ConceptAlbum #RockOpera
November 21, 2025 at 12:56 AM
I missed last week's #Protomen Act III drop. Last week was “The Redline” + “A Show Of Force” #Music #ConceptAlbum #RockOpera
This is a gorgeous photo of SN 1987A taken by the Hubble. #NASA #Space #Science #Astronomy #Physics
Source: en.wikipedia.org/wiki/File:Su...
Source: en.wikipedia.org/wiki/File:Su...
November 18, 2025 at 9:57 PM
This is a gorgeous photo of SN 1987A taken by the Hubble. #NASA #Space #Science #Astronomy #Physics
Source: en.wikipedia.org/wiki/File:Su...
Source: en.wikipedia.org/wiki/File:Su...
New #Protomen! I'm so thrilled to post each and every drop until #ActIII is fully out. theprotomen.bandcamp.com/track/hold-o...
November 4, 2025 at 10:41 PM
New #Protomen! I'm so thrilled to post each and every drop until #ActIII is fully out. theprotomen.bandcamp.com/track/hold-o...
It turns out you can order free hard copies of the NRL Plasma Formulary book from the US Navy. www.nrl.navy.mil/News-Media/P...
The PDF is also freely available.
Making my tax dollars work lol. Though with the shutdown, I don't know if they'll respond. #Physics #Science 🧪⚛️
The PDF is also freely available.
Making my tax dollars work lol. Though with the shutdown, I don't know if they'll respond. #Physics #Science 🧪⚛️
October 31, 2025 at 4:00 PM
It turns out you can order free hard copies of the NRL Plasma Formulary book from the US Navy. www.nrl.navy.mil/News-Media/P...
The PDF is also freely available.
Making my tax dollars work lol. Though with the shutdown, I don't know if they'll respond. #Physics #Science 🧪⚛️
The PDF is also freely available.
Making my tax dollars work lol. Though with the shutdown, I don't know if they'll respond. #Physics #Science 🧪⚛️
#TIL the mathematician #Fibonacci (b. 1170) was one of the early promoters of the Indo-Arabic numeral system in Europe in his 13th century book Liber Abaci where he also printed the now famous Fibonacci sequence 1, 2, 3, 5, 8, 13, ... as a solution to the "rabbit problem." #Science #MathSky 🧪🧮
October 29, 2025 at 4:44 PM
#TIL the mathematician #Fibonacci (b. 1170) was one of the early promoters of the Indo-Arabic numeral system in Europe in his 13th century book Liber Abaci where he also printed the now famous Fibonacci sequence 1, 2, 3, 5, 8, 13, ... as a solution to the "rabbit problem." #Science #MathSky 🧪🧮
This City Made Us! #Protomen #Music #RockOpera Act III drops continue with this rerelease of the 2015 EP song.
theprotomen.bandcamp.com/track/this-c...
theprotomen.bandcamp.com/track/this-c...
October 29, 2025 at 2:07 AM
This City Made Us! #Protomen #Music #RockOpera Act III drops continue with this rerelease of the 2015 EP song.
theprotomen.bandcamp.com/track/this-c...
theprotomen.bandcamp.com/track/this-c...
October 26, 2025 at 3:38 PM
Now here's an example of one of the more useful applications of #AI and #MachineLearning within #Medicine. AI-assisted doctors are significantly better at detecting breast cancers in women. This kind of usage directly saves people's lives. #Science #MedSky 🧪💊
Source: doi.org/10.1038/s415...
Source: doi.org/10.1038/s415...
October 25, 2025 at 5:15 PM
Now here's an example of one of the more useful applications of #AI and #MachineLearning within #Medicine. AI-assisted doctors are significantly better at detecting breast cancers in women. This kind of usage directly saves people's lives. #Science #MedSky 🧪💊
Source: doi.org/10.1038/s415...
Source: doi.org/10.1038/s415...
I recently gave a presentation on #AI which covered in-part the dangers of over-reliance in #Medicine. While lots of attention is on #Education, with good reason, even experts are at risk of "deskilling." #AcademicSky #Science #MedSky 🧪💊
Source: doi.org/10.1016/s246...
Source: doi.org/10.1016/s246...
October 25, 2025 at 1:27 AM
I recently gave a presentation on #AI which covered in-part the dangers of over-reliance in #Medicine. While lots of attention is on #Education, with good reason, even experts are at risk of "deskilling." #AcademicSky #Science #MedSky 🧪💊
Source: doi.org/10.1016/s246...
Source: doi.org/10.1016/s246...
I won't stop #Protomen posting until Act III is fully out and dropped. Calling Out is a great song. #Music #RockOpera
youtu.be/z2Wh3hq2EPQ?...
youtu.be/z2Wh3hq2EPQ?...
October 23, 2025 at 10:12 PM
I won't stop #Protomen posting until Act III is fully out and dropped. Calling Out is a great song. #Music #RockOpera
youtu.be/z2Wh3hq2EPQ?...
youtu.be/z2Wh3hq2EPQ?...
More Act III posting. Today's juice is The Storm and Buried in the Red! Continue the new songs #Protomen! #Music #RockOpera #ConceptAlbum.
October 14, 2025 at 5:24 PM
More Act III posting. Today's juice is The Storm and Buried in the Red! Continue the new songs #Protomen! #Music #RockOpera #ConceptAlbum.
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...
October 8, 2025 at 4:54 PM
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...
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...
Source: www.dpg-physik.de/veroeffentli...
September 20, 2025 at 8:18 PM
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...
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...
Source: doi.org/10.1073/pnas...
September 17, 2025 at 5:45 PM
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...
Source: doi.org/10.1073/pnas...
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...
More info: jila.colorado.edu/~ajsh/bh/col...
September 16, 2025 at 12:24 AM
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...
More info: jila.colorado.edu/~ajsh/bh/col...
#Crocodilian snout bumps = integumentary sensory organs (ISOs). With 4,000 (American alligators) - 9,000 (Nile crocodiles), each is a dome of touch cells that fire at just 0.08 mN or more sensitive than our fingertips! #Science #HerpSky #Biology
See: Leitch & Catania 2012 doi.org/10.1242/jeb....
See: Leitch & Catania 2012 doi.org/10.1242/jeb....
July 21, 2025 at 8:32 PM
#Crocodilian snout bumps = integumentary sensory organs (ISOs). With 4,000 (American alligators) - 9,000 (Nile crocodiles), each is a dome of touch cells that fire at just 0.08 mN or more sensitive than our fingertips! #Science #HerpSky #Biology
See: Leitch & Catania 2012 doi.org/10.1242/jeb....
See: Leitch & Catania 2012 doi.org/10.1242/jeb....
I'm digging the #GitHub style post activity, but for my #BlueSky posts. Thanks @blueskymeter.com! :)
July 20, 2025 at 7:54 PM
I'm digging the #GitHub style post activity, but for my #BlueSky posts. Thanks @blueskymeter.com! :)
The #CMB spectra temperature fluctuations can be broken down using spherical harmonics e.g. monopole + dipole + quadrupole + etc. Like a bumpy potato, the lower order ℓ-multipoles make large-scale bumps; higher order ℓ make tiny bumps. #Science #Physics #Astronomy🧪⚛️🔭
Source: doi.org/10.1086/513698
Source: doi.org/10.1086/513698
July 19, 2025 at 10:34 PM
The #CMB spectra temperature fluctuations can be broken down using spherical harmonics e.g. monopole + dipole + quadrupole + etc. Like a bumpy potato, the lower order ℓ-multipoles make large-scale bumps; higher order ℓ make tiny bumps. #Science #Physics #Astronomy🧪⚛️🔭
Source: doi.org/10.1086/513698
Source: doi.org/10.1086/513698
(1/n) Why do we believe in dark matter when we can't directly see it? The distinction between a "direct" and "indirect" is more a spectrum than a binary. Galaxy rotation is fairly indirect and could be explained by something like modified Newtonian dynamics (MOND). #Science #Physics #Astronomy 🧪⚛️🔭🧵
July 17, 2025 at 1:46 AM
(1/n) Why do we believe in dark matter when we can't directly see it? The distinction between a "direct" and "indirect" is more a spectrum than a binary. Galaxy rotation is fairly indirect and could be explained by something like modified Newtonian dynamics (MOND). #Science #Physics #Astronomy 🧪⚛️🔭🧵
Uranium ore is mostly U-238 - an isotope with a 4.5-billion-year half-life. The fissile star of the show, U-235, makes up just 0.72% of natural uranium. That tiny fraction? It's what fuels reactors and bombs alike. #Science #Physics #NuclearPhysics #Isotopes
Image: en.wikipedia.org/wiki/File:HE...
Image: en.wikipedia.org/wiki/File:HE...
July 7, 2025 at 5:33 PM
Uranium ore is mostly U-238 - an isotope with a 4.5-billion-year half-life. The fissile star of the show, U-235, makes up just 0.72% of natural uranium. That tiny fraction? It's what fuels reactors and bombs alike. #Science #Physics #NuclearPhysics #Isotopes
Image: en.wikipedia.org/wiki/File:HE...
Image: en.wikipedia.org/wiki/File:HE...