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Steve Desch

@deschscoveries.bsky.social

Professor of astrophysics / planetary science / meteoritics at Arizona State University.

674 Posts4878 Follower234 Folgt
Nereide@drnereide.bsky.social · 2d ago

1/2 The four 2023 works by Desch et al. : 1. Statistical Chronometry of Meteorites. I arxiv.org/abs/2212.00390 2. Statistical Chronometry of Meteorites. II arxiv.org/abs/2212.00145 3. Origin of Low-²⁶Al/²⁷Al Corundum/Hibonite Inclusions arxiv.org/abs/2307.07750 🔭🧪⚛️ ⤵️

Statistical Chronometry of Meteorites. I. The Pb-Pb age of the Solar System's t=0

We use rapidly cooled achondrites to test the assumption of 26Al homogeneity in the solar nebula, by checking if there is a single value of tSS, the absolute "Pb-Pb" age of the Solar System's t=0, tha...

arxiv.org

Steve Desch@deschscoveries.bsky.social · 2d ago

One thing I’m positive of is 26Al was uniformly distributed across the solar system at its birth. No heterogeneities, no injection from supernovae or late streamers. See my four 2023 works, including the PP7 book chapter. If an asteroid failed to melt, it formed too late and/or with too much ice.

Nereide@drnereide.bsky.social · last wk.

Jodrell Bank is a piece of world radio #astronomy, a UNESCO World Heritage Site still leading research & training new astronomers🔭🧪⚛️ Shutting it down to save a tiny fraction of science budget is short-sighted. We can't let it become a rusting monument to discoveries never made. #SaveJodrellBank

Astronomer Royal for Scotland | Catherine Heymans@astroroyalscot.bsky.social · last wk.

I'm absolutely devastated for colleagues at Jodrell Bank who found out this morning that funding for the UK's e-MERLIN radio telescope array will be terminated. This is a short-sighted move, to save a tiny fraction of the overall UK science budget. #SaveJodrellBank 🔭🧪 www.bbc.co.uk/news/article...

Waldo Jaquith@waldo.net · 2w ago

The claim “RFK Jr. does not fuck chickens” is not an evidence-based claim because studies have not ruled out the possibility that RFK Jr. fucks chickens.

KEY POINTS • The claim 'vaccines do not cause autism’ is not an evidence-based claim because studies have not ruled out the possibility that infant vaccines cause autism.
Steve Desch@deschscoveries.bsky.social · 2w ago

Great thread but sad reminder that from self-promoting advisers to greedy oligarchs, the patriarchy always seems to get a cut. I wish for a world where credit goes where credit is due and everybody benefits.

Nereide@drnereide.bsky.social · 3w ago

1/8 15 July 1943 – Jocelyn Bell Burnell was born. In 1967 she discovered #pulsars.🔭 🧪⚛️ The 1974 Nobel Prize went to two men. Not to her. As of 2025 data, women are just 2.2% of Physics Nobel winners. J. B. Burnell isn't an exception. Her case is still the rule. #histsci #WomenInSTEM

Jocelyn Bell (Burnell) pictured at the Mullard Radio Observatory in 1967 with the pulsar chart, left. Image courtesy of the Cavendish Laboratory. https://www.cam.ac.uk/stories/discovery-bell-burnell-pulsar-chart
Steve Desch@deschscoveries.bsky.social · 2w ago

Very cool revision of a solar abundance. But I’m not singing “Re, a drop of silver sun.”

Linn Boldt-Christmas@nplinnspace.bsky.social · 2w ago

🔭 Did you know that there is *silver* in the Sun? If yes: did you know we JUST found out there’s 55% more than previously thought?! +0.19 dex from ref values, which is a LOT! The culprit? (Scooby-Doo villain reveal) As always, those darn meddling 3D non-LTE effects!!! 👻 Press release & paper ⬇️

Nereide@drnereide.bsky.social · 2w ago

1/11 Imagine having a detailed map of the youngest & hottest stars in the #MilkyWay — the ones that form & die within just a few million years. A research team (Quintana et al.) has recently completed exactly that using Gaia DR3 data, reaching out to 2 kpc (~ 6,520 ly) from the Sun.🔭⚛️🧪 #galactic

Here’s how OB-type stars are spread across our local Milky Way, out to 2 kpc from the Sun. The red and pink patches reveal the denser concentrations of these young stars. Among the standout features are the Sagittarius-Carina arm, Cepheus Spur, the big empty Perseus Gap, and associations such as Cyg OB2 and Ori OB1. Credit: Figure 5 (right panel) – Quintana et al. 2026
Nereide@drnereide.bsky.social · 3w ago

1/12 John Baez et al. have just published a paper linking decades-old #mathematics to a new way of thinking about quantum mechanics. 🔭🧪⚛️ The result? The Standard Model (SM) of particles seems to emerge naturally from certain mathematical structures. Here’s a simple explanation, I hope. #physics

Colorful diagram showing the known elementary particles of the Standard Model. It groups quarks, leptons, force carriers and the Higgs boson, with labels explaining their interactions. The image illustrates how particles relate through the electromagnetic, weak, and strong forces in today's universe. Image credit: Matt Strassler. Source: https://tinyurl.com/2j96ja2x
Scott Horton@robertscotthorton.bsky.social · last mo.

Elon Musk is a South African who came to the US under a fraudulently secured student visa to study at Stanford (he never enrolled). Through further fraud, he secured a green card and then was naturalized as a US citizen. His US citizenship can be revoked. He also holds a Canadian passport.

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Lance Ellisor@ellisor.net · last mo.

this thread about some truly cray cray stuff. come for Belarus insanity but stay for Zuck dipshittery.

By Cory Doctorow (GPG 0xBF3D9110957E5F4C)@doctorow.pluralistic.net · last mo.

More than a decade ago, a group of young, internet-connected Belarusian dissidents launched a series of increasingly high-stakes, increasingly surreal confrontations with the corrupt, authoritarian government of Alexander Lukashenka, a man who is often called "the last Soviet dictator." 1/

Four female chorousters in sumptuous Renaissance robes. Each one's mouth has been stopped up by a Facebook 'thumbs up' icon. Behind them looms Mark Zuckerberg's grinning Metaverse avatar. The book they are reading from has flooded their faces with light. In the background is a sky full of ominous blue/red clouds.
TK (Takashi DY) Kozai@bioniclab.bsky.social · last mo.

🔬 Your tax dollars once paid a physicist whose own colleagues told him he was wasting the university's money. In 1951, Charles Townes sat on a D.C. park bench and worked out, on the back of an envelope, how to force molecules to release coherent radiation. 🧵 1/5

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Senator Patty Murray@murray.senate.gov · 2mo ago

Scientists in Atlanta were stopped from criticizing the Trump admin at a scientific conference, so let me do it here: Trump is destroying biomedical research in America, and it will take decades to get back on track.  Spread the word. Stand up for science.