Tag: #astronomy

Astronomers Spot a ‘Ghost Galaxy’ Made Almost Entirely of Dark Matter

Using Hubble, Euclid and Subaru, researchers confirmed an ultra-faint Perseus cluster galaxy whose mass appears to be more than 99% dark matter.

#darkmatter, #astronomy, #hubble, #euclid, #galaxies

LIGO’s latest catalog doubles the haul of gravitational-wave detections, revealing new black hole patterns

The GWTC-4.0 catalog adds 128 new merger candidates from LIGO’s latest run, bringing the total to 218 and sharpening clues about black holes and cosmic expansion.

#gravitationalwaves, #ligo, #blackholes, #astronomy, #cosmology

Rubin Observatory’s real-time sky alerts debut with 800,000 notifications in a night

Vera C. Rubin Observatory’s first large-scale public test sent 800,000 rapid alerts, previewing a system built for millions nightly in LSST.

#astronomy, #rubinobservatory, #lsst, #space, #datastreams

Hubble pins down the size of interstellar comet 3I/ATLAS, bolstering natural-origin case

New Hubble analysis extracts the first solid measurement of an interstellar comet’s ядро: a ~2.6-km, elongated nucleus behaving like ordinary comets.

#astronomy, #hubble, #comets, #interstellar

Kepler Data Reveal a One-Transit Candidate: An Earth-Size Planet on a Near-Earth-Year Orbit

A single dip in Kepler’s K2 data points to an Earth-size planet candidate with a ~355-day orbit around a bright nearby orange dwarf—if it transits again.

#exoplanets, #nasa, #kepler, #astronomy, #jameswebb

James Webb Telescope Watches Baby Star Forge Crystals and Blow Them Toward Comet Zones

Webb tracked a young star’s outbursts as they turned dust into crystalline minerals and lofted them outward—explaining crystals found in icy comets.

#jwst, #astronomy, #protostars, #comets, #planetformation

‘Cotton-candy’ planets around young star offer rare glimpse of how worlds shrink with age

Four ultra-puffy planets orbiting 20-million-year-old V1298 Tau reveal how newborn worlds lose atmospheres and contract into common super-Earths.

#exoplanets, #astronomy, #nasa, #planetformation, #jwst

Solar Orbiter Captures ‘Magnetic Avalanche’ Building a Major Solar Flare

ESA’s Solar Orbiter watched a big flare ignite through a cascade of tiny magnetic failures, supporting long-standing avalanche models and aiding space-weather forecasting.

#solarorbiter, #solarflare, #spaceweather, #esa, #astronomy

Webb Confirms ‘Normal’ Galaxy From Cosmic Dawn, 310 Million Years After the Big Bang

A Webb spectrum pins PAN-z14-1 at redshift 13.53, revealing a large, bright but weak-line galaxy that hints at early diversity.

#jameswebb, #astronomy, #galaxies, #cosmicdawn, #arxiv

Hubble Spots a ‘Failed Galaxy’: Dark-Matter Cloud Cloud‑9 Has Gas but No Stars

Near galaxy M94, Hubble confirms Cloud‑9: a dark‑matter halo filled with hydrogen yet essentially starless, matching long‑predicted ‘failed galaxies.’

#hubble, #darkmatter, #galaxies, #astronomy, #cosmology

Astronomers Precisely Weigh a Rogue Planet After a Lucky Gaia Flyby

A brief microlensing flare seen from Earth and ESA’s Gaia let researchers measure the mass and distance of a Saturn-like rogue planet 10,000 light-years away.

#astronomy, #exoplanets, #gaia, #microlensing

Webb Spots Earliest Known Supernova After Gamma-Ray Burst From Cosmic Dawn

A gamma-ray burst flagged by the SVOM telescope led Webb to the earliest confirmed supernova, showing massive stars died in familiar ways just 730 million years after the Big Bang.

#astronomy, #space, #jwst, #supernova, #gammarayburst

Astronomers Observe Unprecedented 7-Hour Gamma-Ray Burst

Record-breaking gamma-ray burst challenges existing models, suggesting new cosmic explosion mechanisms.

#gamma-ray, #astronomy, #space, #astrophysics

Geminid Meteor Shower to Light Up Skies in December 2025

Experience the 2025 Geminid meteor shower with up to 120 meteors per hour on Dec 13-14, under a dark sky and crescent moon.

#geminid, #meteorshower, #astronomy, #phaethon, #stargazing

Comet 3I/ATLAS: A Rare Interstellar Visitor Illuminates Our Solar System

Astronomers study Comet 3I/ATLAS, only the third interstellar object known, offering insights into cosmic material and planetary formation.

#space, #astronomy, #comet, #interstellar, #NASA