Physicist interested in Astrophysics & Particle Physics| Research in Math & Science Edu| Math & Science Writer| Teacher & Teacher Trainer| WomenInSTEM

Joined June 2007
5,315 Photos and videos
Nereide retweeted
🧵1/4 What is this? An extraordinary abstract painting? Nope! This is an enhanced-color image of #Mars taken by NASA’s Psyche spacecraft during its gravity-assist flyby last May 15.šŸ”­ science.nasa.gov/photojourna… #universe #astronomy #science
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Nereide retweeted
Jun 10
2/2 Yes, it’s an all-male crew with strong military backgrounds. Many people (including me) are disappointed not to see any female astronaut selected this time. Ā  But these four deserve our full support. They’re flying the critical dress rehearsal in low Earth orbit — testing docking and operations with the Starship HLS and Blue Moon pathfinders — before the real lunar landing missions begin. Artemis IV is the one that should finally put women back on the path to the Moon. For now, let’s cheer on the Fantastic 4. History loading… Earth → Moon nasa.gov/image-article/artem… #ArtemisIII #NASA #Moon2027 #ESA
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Nereide retweeted
Jun 10
1/2 NASA has revealed the Artemis III crew — and it’s an absolute powerhouse. Commander Randy Bresnik (@AstroKomrade), veteran test pilot, former ISS commander and USMC colonel. Pilot Luca Parmitano (@Astro_Luca), ESA’s two-time space veteran and the first Italian to command the ISS. Mission Specialist Frank Rubio, physician and long-duration record holder. Mission Specialist Andre Douglas (@Astro_AndreD) on his first flight. #ArtemisIII #NASA #Moon2027 #ESA
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Nereide retweeted
🧵1/5 Astronomers have found strong new evidence that some hot giant #exoplanets have magnetic fields similar in strength to those in our own Solar System. The result comes from studying how fast winds blow across seven ultra-hot Jupiters. eso.org/public/unitedkingdom… #astronomy #universe
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Nereide retweeted
🧵1/6 Researchers have completed a family of extremely rare particles! LHCb at #CERN has found the Ī©cc⁺ — a heavy baryon made of two charm quarks and one strange quark. Final piece of a more than 60-year puzzle. A beautiful result for particle #physics!
šŸ“£ Public announcement: we are closing a multiplet! šŸ§Ŗāš›ļø
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Nereide retweeted
🧵1/5 Messier 77 (M77 or NGC 1068), at "only" 45 Mly away in Cetus, gives us a clear view of both a busy star-forming disk and a very energetic core. A new mid-infrared image from #JWST’s MIRI instrument shows it in remarkable detail. esahubble.org/images/sci2600… #universe #astronomy
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Nereide retweeted
May 25
🧵1/6 This is a historic milestone: the very first public image from VISTA telescope (Dec 2009).šŸ”­ It features the Flame Nebula (NGC 2024) in Orion and its surroundings. Hidden in visible light, it bursts with newborn stars in infrared. Captured with J, H and Ks filters, this image reveals the dense cluster of very young stars at its core. It also includes NGC 2023 and the ghostly Horsehead Nebula — all in just 14 minutes of exposure. eso.org/public/images/eso094… #histsci #galactic #astronomy
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Nereide retweeted
May 23
🧵1/7 Astronomers detected gamma rays from a rare superluminous supernova using NASA’s Fermi telescope. šŸ”­ This work offers a new view into what powers these unusually bright explosions. science.nasa.gov/missions/fe… #cosmology #stellarastro #astronomy
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Nereide retweeted
May 21
1/5 #Mathematicians have a stunning new way to tell knots apart: each one now gets its own unique hexagonal ā€œQR codeā€, delicate and symmetric like a snowflake. Developed by Dror Bar-Natan and Roland van der Veen, it’s both fast and incredibly powerful. This is exciting stuff. #Math #Mathematics
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Nereide retweeted
May 19
1/2 Congrats to @ATLASexperiment! The ATLAS team at #CERN reported spotting a new particle — the Bc*⁺ meson. It’s the 82nd hadronic particle found at the LHC. It’s been 14 years since their last new particle discovery. #physics
Congrats to @atlasexperiment for the observation the Bc*⁺ meson. It's hadron number 82 at the LHC. It's been 14 year since ATLAS reported the first new particle observed at the LHC, the χb(3P). All hadrons are at koppenburg.ch/particles.html Preprint: arxiv.org/abs/2605.16228
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Nereide retweeted
May 17
🧵1/5 Picture this: we’ve recently peered straight into the heart of an active #galaxy 13 Mly away. Using the #JWST, astronomers have shown that the hot dust around its supermassive #blackhole isn’t mostly escaping in outflows, as everyone thought for decades. science.nasa.gov/missions/we… #cosmology
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Nereide retweeted
May 14
1/6 Astronomers recently revealed a giant cosmic structure that had been hiding behind the stars and dust of our own Milky Way. šŸ”­ āš›ļø Press release: sarao.ac.za/news/vela-the-tr… #cosmology #universe #MilkyWay
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Nereide retweeted
24 Jul 2025
For centuries, Betelgeuse, the iconic red supergiant in Orion, has fascinated astronomers with its changing brightness. Why does its light vary over a ~6-year cycle? Thanks to the Gemini North telescope, we now have an answer: Betelgeuse has a companion star! A research team, led by Steve Howell (NASA Ames Research Center), used the ’Alopeke speckle imager on Gemini North to observe Betelgeuse with unprecedented precision. In Dec. 2024, three days after the predicted time of maximum angular separation, a star ~6 magnitudes fainter was detected, which is assumed to be coeval with Betelgeuse with an estimated age of 10 Myr. This long-awaited discovery confirms recent studies predicting a companion star to explain Betelgeuse’s 6-year brightness variations. The detection has a significance of ~1.5σ (a low-confidence detection, requiring further confirmation). The position and angular separation correspond to the predictions of Goldberg et al. (2024) and MacLeod et al. (2025). Named Siwarha ("Her Bracelet" in Arabic, reflecting Betelgeuse’s "Hand of the Giant"), this young, hot star—likely a pre-main-sequence F-dwarf with ~1.6 times the Sun’s mass and a temperature of ~7400 K—orbits Betelgeuse at an estimated physical distance of ~8–10 au (based on a ~52 milliarcsecond angular separation), though the press release suggests ~4 au, possibly a simplified estimate or the closest orbital distance. Siwarha was discovered thanks to the speckle imaging technique, which eliminated the distortions of Earth's atmosphere. During the 2019–2020 "Great Dimming", its companion was unobservable, as expected, because it was located "behind" the red supergiant. But in 2024, it reappeared: its position and brightness matched exactly the predictions based on dynamical analyses. Siwarha is likely key to understanding long-term brightness variations, which cannot be explained by stellar pulsations alone. Furthermore, it offers a unique glimpse into the life of Betelgeuse, which will eventually explode as a supernova in the "distant" future. Siwarha, influenced by strong tidal forces, could spiral toward the red supergiant and disappear within the next 10,000 years. This discovery paves the way for new observations. In November 2027, when Siwarha will reach maximum angular separation again, scientists will have another opportunity to study it and confirm its characteristics. The discovery of Betelgeuse's stellar companion is not only an extraordinary technical achievement, but another piece of the puzzle in understanding red supergiants and their fate. I have a question: ā€œWhat will Betelgeuse’s supernova look like in the distant future?ā€ ------------------------------- Image Credit: International Gemini Observatory/NOIRLab/NSF/AURA Image Processing: M. Zamani (NSF NOIRLab) Press releaseāž”ļønoirlab.edu/public/news/noir… Research paper: "The Probable Direct-Imaging Detection of the Stellar Companion to Betelgeuse"āž”ļøarxiv.org/abs/2507.15749
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🧵1/4 What is this? An extraordinary abstract painting? Nope! This is an enhanced-color image of #Mars taken by NASA’s Psyche spacecraft during its gravity-assist flyby last May 15.šŸ”­ science.nasa.gov/photojourna… #universe #astronomy #science
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3/4 Psyche is currently on its way to the metal-rich asteroid that shares its name — arrival is planned for 2029. The Mars flyby gave it a nice speed boost and a chance to test the camera in actual space conditions.
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4/4 This image was taken shortly after the closest approach using Imager A. The view combines red, green, and blue filter data to bring out surface details beyond what the human eye would see. Credits: NASA / JPL-Caltech / ASU
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Nereide retweeted
14 Jun 2024
According to a new study from Wang, W., Vidale, J.E., Pang, G. et al., published 12 June 2024 in Nature, the Earth’s inner core began to slow down its rotation's speed compared with the planet’s surface around 2010. The researchers think that this slowdown was due to the churning of the liquid outer core surrounding the solid inner core, as well as by gravitational pulls from dense regions of the overlying mantle. With a radius that is about 70% of the Moon's radius, the Earth's inner core is essentially a solid ball believed to be composed of an iron–nickel alloy, located at a depth of over 4,800 km. It is not accessible for direct measurement, so information about it mostly comes from analysis of seismic waves and Earth's magnetic field. The authors of this study used data obtained from 121 repeating earthquakes that occurred in the South Sandwich Islands, in the South Atlantic Ocean, between 1991 and 2023, as well as data obtained thanks to Soviet nuclear tests between 1971 and 1974, in addition to French and American nuclear tests. In summary, Earth's inner core is backtracking and slowing down in relation to the planet's surface. The researchers hypothesize that this change could alter the length of the day on the order of fractions of a second, an infinitesimal change that would be difficult to notice. Further reading and referenceāž”ļøtoday.usc.edu/usc-study-conf… Paper 'Inner core backtracking by seismic waveform change reversals'āž”ļønature.com/articles/s41586-0… Image: USC Graphic/Edward Sotelo #Earth #research
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Nereide retweeted
14 Jun 2023
1/3 The imagery of flowers isn't rare in the sky. Here's NGC 7023, the Iris Nebula, a stupendous and bright reflection nebula lying in Cepheus, 1,300 ly away. The bright blue portion is 6 ly across. Credit and infoāž”ļøgo.nasa.gov/3F1emJl #scritturebrevi #VentagliDiParole
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Nereide retweeted
13 Jun 2024
13 June 1831: the great physicist and mathematician James Clerk Maxwell was born. Once Einstein said: "There would be no modern physics without Maxwell’s electromagnetic equations: I owe more to Maxwell than to anyone.ā€ In his office in Princeton there were three portraits: Newton, Faraday, Maxwell. Maxwell did revolutionary work on electricity, magnetism, optics and on the kinetic theory of gases. Specifically, he developed the first modern theory of electromagnetism by unifying, through the so-called Maxwell equations, previous observations, experiments and equations of this branch of physics. In his work A Dynamical Theory of the Electromagnetic Field (1865), he proposed that the electromagnetic field, as described by his equations, was the cause of electrical, magnetic, and optical phenomena. His unified model for electromagnetism is considered the second great unification of physics, after that brought about by Newton. (royalsocietypublishing.org/d…) Today he is recognised as one of three most important scientists of an era spanning some 300 years, which began with Newton and closed with Einstein. Without their revolutionary works we wouldn't have either the civilisation that we have or the ability to understand the way the world works, and what we should do to make it better. On the centenary of Maxwell's bday, Einstein described his work as the "most profound and the most fruitful that physics has experienced since the time of Newton". In Einstein’s view, in fact, Maxwell's equations were pivotal to the development of his own theory of relativity, first published in 1905. Richard Feynman said of him "there can be little doubt that the most significant event of the 19th century will be judged as Maxwell’s discovery of the laws of electrodynamics". Maxwell passed away at age of only 48. Ten years after his death, Hertz definitely proved what Maxwell had theorised. A biographyāž”ļø mathshistory.st-andrews.ac.u… Image viaāž”ļøwendieamanophysicsblog.wordp… Further reading and references āž”ļøncbi.nlm.nih.gov/pmc/article… āž”ļøclerkmaxwellfoundation.org/N… #Maxwell #electricity #magnetism #physics
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