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Nereide

@drnereide.bsky.social

Physicist interested in Astrophysics and Particle Physics| Research in Math and Science Edu| Math and Science Writer| Teacher and Teacher Trainer My blog: https://www.tutto-scienze.org/ More about me: https://www.linkedin.com/in/annarita-ruberto-3970507/

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Nereide@drnereide.bsky.social · yesterday

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.

ESO@eso.org · 2d ago

Total solar eclipse loading ☀️🌕🌍 On 12 August, the Moon will slip between the Earth and the Sun, turning day into night for up to a minute and a half along the path of totality. Get the gist with ESO fellow Mar Carretero Castrillo 🎬👇 🔭 #EuropeanSolarEclipse #TotalSolarEclipse 1/4

John C. Baez@johncarlosbaez.bsky.social · 2d ago

If the universities become too corrupt, maybe we'll return to the roots from which universities emerged: individual scholars advertising their willingness to take on students for a fee! Over time these scholars got more organized and formed universities.... en.wikipedia.org/wiki/Medieva...

Characteristics Initially medieval universities did not have physical facilities such as the campus of a modern university. Classes were taught wherever space was available, such as churches and homes. A university was not a physical space but a collection of individuals banded together as a universitas. Soon, however, universities began to rent, buy or construct buildings specifically for the purposes of teaching.[27] Universities were generally structured along three types, depending on who paid the teachers. The first type was in Bologna, where students hired and paid for the teachers. The second type was in Paris, where teachers were paid by the church. Oxford and Cambridge were predominantly supported by the crown and the state, which helped them survive the Dissolution of the Monasteries in 1538 and the subsequent removal of all principal Catholic institutions in England. These structural differences created other characteristics. At the Bologna university the students ran everything—a fact that often put teachers under great pressure and disadvantage. In Paris, teachers ran the school; thus Paris became the premiere spot for teachers from all over Europe. Also, in Paris the main subject matter was theology, so control of the qualifications awarded was in the hands of an external authority – the chancellor of the diocese. In Bologna, where students chose more secular studies, the main subject was law. It was also characteristic of teachers and scholars to move around. Universities often competed to secure the best and most popular teachers, leading to the marketisation of teaching. Universities published their list of scholars to entice students to study at their institution. Students of Peter Abelard followed him to Melun, Corbeil, and Paris,[28] showing that popular teachers brought students with them. From https://en.wikipedia.org/wiki/Medieval_university#Establishment
Arula Ratnakar@arula-ratnakar.bsky.social · 3d ago

Maybe in the age of LLMs instead of becoming a professor I’ll one day start some cult like thing trying to preserve the pencil and paper methodology of developing theories. And I’d take on apprentices who want to learn the art.

Nereide@drnereide.bsky.social · 2d ago

The Chinese Chang’e 5-T1 stage, not a Falcon 9.🔭🧪⚛️ Gorman called these events a litmus test. Four years later the test continues: how many more uncontrolled impacts will we accept before we start treating cislunar space — and the #Moon itself — as an #environment that requires real stewardship?

Dr Space Junk (Alice Gorman)@drspacejunk.bsky.social · 3d ago

In 2022 a Chinese rocket impacted the Moon. 'The Moon is struck by meteors all the time. In many ways, the Falcon 9 impact will be just another one. What makes it interesting is how it acts as a litmus test for changing public opinions about our responsibilities to the space environment'. 🧪

Nereide@drnereide.bsky.social · last wk.

Yes. The window is narrow and tech is racing ahead. But surrendering early is the worst choice. Science, activism and diplomacy have protected global commons before — against far stronger economic interests. The night sky deserves the same fight. 🔭⚛️🧪 We aren't powerless. #ProtectTheNightSky

CosmicRami 🏳️‍🌈🏳️‍⚧️@rami.spaceaustralia.com · last wk.

Nope. I don’t accept this position — that we are powerless to change the outcome of this mess. We have a small, time-critical window where we can collectively navigate through this. Also don’t forget, these are commercial entities that are selling products/services that are subject to laws.

Nereide@drnereide.bsky.social · last wk.

1/6 In 2025, Gemini North data gave only a weak 1.5σ hint of a companion near Betelgeuse — a signal just strong enough to notice.🔭 The new VLT/SPHERE data raise the detection to a solid 6.1σ level (5.1σ with another method), making the result far more convincing & confirming the same location.🧪⚛️

ESO@eso.org · last wk.

The conclusion of a century-long quest 😲 Our VLT obtained firm evidence that Betelgeuse, a red supergiant star in the Orion constellation and one of the most famous stars in the night sky, is not alone! 🔭 🧪 1/4

A collage of various astronomical images. The background image shows a wide view of a starry night sky, with blue lines connecting the stars of the Orion constellation. An inset image zooms into the star Betelgeuse, showing its orange surface. A second inset shows a bright companion next to the star. Image by ESO/M. Montargès et al. Background: N. Rissinger (skysurvey.org).
Nereide@drnereide.bsky.social · last wk.

Yes. The window is narrow and tech is racing ahead. But surrendering early is the worst choice. Science, activism and diplomacy have protected global commons before — against far stronger economic interests. The night sky deserves the same fight. 🔭⚛️🧪 We aren't powerless. #ProtectTheNightSky

CosmicRami 🏳️‍🌈🏳️‍⚧️@rami.spaceaustralia.com · last wk.

Nope. I don’t accept this position — that we are powerless to change the outcome of this mess. We have a small, time-critical window where we can collectively navigate through this. Also don’t forget, these are commercial entities that are selling products/services that are subject to laws.

Nereide@drnereide.bsky.social · last wk.

1/6 In 2025, Gemini North data gave only a weak 1.5σ hint of a companion near Betelgeuse — a signal just strong enough to notice.🔭 The new VLT/SPHERE data raise the detection to a solid 6.1σ level (5.1σ with another method), making the result far more convincing & confirming the same location.🧪⚛️

ESO@eso.org · last wk.

The conclusion of a century-long quest 😲 Our VLT obtained firm evidence that Betelgeuse, a red supergiant star in the Orion constellation and one of the most famous stars in the night sky, is not alone! 🔭 🧪 1/4

A collage of various astronomical images. The background image shows a wide view of a starry night sky, with blue lines connecting the stars of the Orion constellation. An inset image zooms into the star Betelgeuse, showing its orange surface. A second inset shows a bright companion next to the star. Image by ESO/M. Montargès et al. Background: N. Rissinger (skysurvey.org).
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...

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...

Nereide@drnereide.bsky.social · last wk.

1/ On 26 July 1895, Pierre Curie & Maria Skłodowska had a civil wedding ceremony in Sceaux. Marie didn’t wear a traditional wedding dress. She chose a plain dark blue one instead — practical enough that she could keep wearing it in the lab for years afterwards. ⚛️🧪 #HistSci #WomenInSTEM #science

Black and white portrait of Pierre Curie (left) and Maria Skłodowska (right), on their wedding day. Marie is holding onto Pierre's arm by looking directly into the camera. He looks past the camera. Image in the Public Domain Via Wikimedia Commons
Nereide@drnereide.bsky.social · last wk.

Results like Joan Birman’s at 99 strike us so powerfully not only because of her age, but because they remind us that mathematical research is not a means to some external end. It is, in itself, a way of inhabiting the world with greater clarity. Read Greg Egan’s thread. #HistMath 🧪 #mathematics

Greg Egan@gregegansf.bsky.social · last wk.

While the Fields Medal celebrates the under-40s, the mathematician Joan Birman has, at the age of 99, solved a major open problem in representations of the Braid groups, a topic she has worked on for more than 60 years.

Nereide@drnereide.bsky.social · last wk.

1/ What’s maybe missed is that this cute corollary stage almost never comes from finding a simpler direct proof of the same statement. It usually requires the invention of an entirely new language or conceptual framework (group theory, in this case) that reorganizes a large region of math at once.

John C. Baez@johncarlosbaez.bsky.social · 2w ago

And of course key results keep getting reinterpreted as time passes, with hard results often becoming cute corollaries 50 or 100 years later. For example many important basic results in number theory became easy spinoffs of group theory (which was developed later), like Fermat's Little Theorem.

Nereide@drnereide.bsky.social · last wk.

1/ On 26 July 1895, Pierre Curie & Maria Skłodowska had a civil wedding ceremony in Sceaux. Marie didn’t wear a traditional wedding dress. She chose a plain dark blue one instead — practical enough that she could keep wearing it in the lab for years afterwards. ⚛️🧪 #HistSci #WomenInSTEM #science

Black and white portrait of Pierre Curie (left) and Maria Skłodowska (right), on their wedding day. Marie is holding onto Pierre's arm by looking directly into the camera. He looks past the camera. Image in the Public Domain Via Wikimedia Commons
Nereide@drnereide.bsky.social · 2w ago

1/9 A team led by Kevin Hoy has published evidence in Nature for a planetary-mass object orbiting the brown dwarf CD-35 2722 B. 🔭🧪⚛️ It's not yet a definitive confirmation, but the authors describe it as strong evidence & the first plausible detection of this kind. #planetsci #browndwarf #science

Artist’s impression of the CD-35 2722 system. Near the top you can see the star as a tiny bright point. The large reddish-brown object filling most of the lower half is the brown dwarf. To its right is a smaller body, roughly Jupiter’s mass, that orbits the brown dwarf while the brown dwarf itself orbits the star. Credit: ESO/M. Kornmesser https://www.eso.org/public/images/eso2610b/
Nereide@drnereide.bsky.social · last wk.

1/ What’s maybe missed is that this cute corollary stage almost never comes from finding a simpler direct proof of the same statement. It usually requires the invention of an entirely new language or conceptual framework (group theory, in this case) that reorganizes a large region of math at once.

John C. Baez@johncarlosbaez.bsky.social · 2w ago

And of course key results keep getting reinterpreted as time passes, with hard results often becoming cute corollaries 50 or 100 years later. For example many important basic results in number theory became easy spinoffs of group theory (which was developed later), like Fermat's Little Theorem.

Nereide@drnereide.bsky.social · 2w ago

1/9 A team led by Kevin Hoy has published evidence in Nature for a planetary-mass object orbiting the brown dwarf CD-35 2722 B. 🔭🧪⚛️ It's not yet a definitive confirmation, but the authors describe it as strong evidence & the first plausible detection of this kind. #planetsci #browndwarf #science

Artist’s impression of the CD-35 2722 system. Near the top you can see the star as a tiny bright point. The large reddish-brown object filling most of the lower half is the brown dwarf. To its right is a smaller body, roughly Jupiter’s mass, that orbits the brown dwarf while the brown dwarf itself orbits the star. Credit: ESO/M. Kornmesser https://www.eso.org/public/images/eso2610b/