astronomy8.585 min read
Dense Mega-Earth Gliese 523b Defies Planet Formation Theories with Polar Orbit
3 days ago•Source: Sci.News
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4.39 min•7 days ago
Ancient Milky Way merger revealed by globular-cluster fossils
A Nature Astronomy study uses precise ages and metallicities of Milky Way globular clusters to reconstruct the Galaxy’s early growth, revealing three distinct age–metallicity tracks and an ancient major merger (progenitor Low-energy–Kraken–Heracles) about 12 billion years ago with roughly 500 million solar masses, depositing most material in the inner Milky Way. This refines the Milky Way’s formative timeline and complements JWST views of distant galaxies by tying together fossil stars and early-universe observations.
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1842 Shadow Bands: Earth's Breath Remains an Unsolved Eclipse Enigma
Space Daily•12 days ago
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Cosmic recycling unveiled: dying stars seed the next generation
Scientific American•12 days ago
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Colossal IC 1101: The Universe’s Largest Known Galaxy Emerges
Ultra-deep imaging confirms IC 1101, at the center of Abell 2029, as the largest known galaxy, spanning about 1.7 million light-years and containing ~3.4 trillion solar masses in stars. Using the Isaac Newton Telescope and a star-subtraction technique, researchers teased out the galaxy’s faint outer halo from foreground Milky Way stars, revealing eight structures beyond its edge and evidence of ongoing growth via accretion and a 2–3 billion-year merger. The work, in arXiv ahead of Astronomy and Astrophysics, highlights how brightest cluster galaxies grow by absorbing neighbors and how their outer regions blend into the cluster.
Betelgeuse's Hidden Partner Emerges in Sharp New Image
Astronomers using the European Southern Observatory's Very Large Telescope with the SPHERE instrument released the clearest image yet of Betelgeuse B, a possible companion star, suggesting Betelgeuse is a binary system. Betelgeuse B is estimated to have 2–3 times the Sun’s mass. Follow‑up observations over a full orbit are needed to confirm the companion's path and to assess any influence on Betelgeuse’s future supernova.
Betelgeuse's Secret Twin Emerges: Betelgeuse B Unveiled as a Companion
A sharp image from ESO's Very Large Telescope reveals a faint companion near Betelgeuse, named Betelgeuse B: a young, hot star about 2.6–3.1 solar masses orbiting the red supergiant at roughly the Saturn–Sun distance. The finding, supported by two independent image-processing methods and strong statistical significance, suggests Betelgeuse is a binary/multiple system; although orbital motion still needs to be observed to confirm binding, the result has important implications for how massive stars form and how their winds and mass loss operate.
Milky Way’s ancient 90-degree flip reshaped its halo
New Gaia measurements and computer simulations show the Milky Way’s halo rotates more slowly than its disk, likely because the galaxy underwent ancient head-on mergers and a dramatic disk flip that reoriented the disk by about 90 degrees. This misalignment slows halo rotation and could have shifted the solar system’s orbit, though the exact mechanism remains under investigation.
Helium Clue Reveals Atmosphere on Earth-Like Exoplanet in Habitable Zone
Astronomers have found the strongest evidence yet that the rocky exoplanet LHS 1140 b, orbiting a red dwarf in its habitable zone, retains an atmosphere, inferred from helium escaping from the planet and detected with ground-based spectroscopy; the result suggests Earth-like worlds can maintain atmospheres for billions of years and opens new avenues to study their habitability.
Three bright stars unlock the summer night sky
Space.com explains how the Summer Triangle—Altair, Vega and Deneb—serves as an easy anchor to learn the night sky this July: Altair is nearby (~17 light-years), Vega ~25 ly, and Deneb is extraordinarily distant (~2,600 ly). Spotting the triangle around 11 p.m. gives a mental map to the Milky Way, Cygnus, and surrounding regions, turning stargazing into a three‑dimensional exploration rather than a flat view. The piece also notes observing tips with binoculars or a telescope, mentions the Moon’s approach to Antares later in July, and points to nearby constellations Sagitta and Delphinus to help beginners map the sky by exploring regions instead of chasing individual objects.
Cosmic 'missing' matter found drifting between galaxies, hurled there by violent galactic processes
Researchers using CHIME/FRB data and DESI galaxy maps cross-correlated thousands of fast radio bursts with galaxy locations to show a substantial amount of ordinary matter lies outside galaxies in diffuse clouds, likely ejected by energetic events such as black hole jets and supernovae—brightening the picture of where the universe’s missing baryons reside and implying these galactic processes are more powerful than previously thought.
LOFAR maps the magnetic backbone of a galaxy cluster for the first time
Using 224 hours of LOFAR radio observations, astronomers produced the deepest map yet of the galaxy cluster Abell 2255 and reconstructed its magnetic field from core to outskirts for the first time. The results show the magnetic field is shaped by gas motions during cluster formation, with field lines tracing extended radio emissions and showing tangential orientations in regions affected by shocks, providing new insight into how magnetic fields and the largest cosmic structures grow. The study is accepted for publication in Astronomy & Astrophysics and is available on arXiv.
Neutrinos Carry the Hidden Energy of Core-Collapse Supernovae
Core-collapse supernovae emit the vast majority of their energy as neutrinos rather than light—about 99% versus 0.1–1% in photons—because electron capture in the collapsing core produces neutrinos that escape with little interaction. This neutrino burst powers the explosion and confirms the energy budget, as demonstrated by SN 1987A's detections; with detectors like Hyper-Kamiokande and IceCube, a future galactic SN would yield millions of neutrinos, making neutrinos the primary energy carrier in these events.
Cosmic sugar discovery: four-carbon erythrulose detected in interstellar space
Ultrasensitive broadband spectral surveys with the Yebes 40 m and IRAM 30 m telescopes led to the first detection of erythrulose, a four‑carbon ketose, in the interstellar medium toward the Galactic Centre cloud G+0.693−0.027. Erythrulose is at least 8–17 times more abundant than the undetected C3 sugars in this cloud, and its formation is explained by grain-surface chemistry combining glycolaldehyde and ethylene glycol via fast hydrogen-abstracting reactions on icy dust grains, followed by an intersystem crossing to yield the chiral sugar. Astrophysical modeling (LTE fits and kinetic Monte Carlo simulations) reproduces its presence under typical Galactic Centre conditions, suggesting interstellar sugars could contribute to prebiotic inventories and potentially to the origin of biological homochirality on early Earth, linking ISM chemistry to meteoritic organics and solar-system material.