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Cosmology

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Direct Collision With the LMC Explains the Small Magellanic Cloud’s Odd Motions

Tailored simulations reveal a past disk crossing that erased real gas rotation, resolving decades of conflicting readings.

Ancient Star in Pictor II Bears the Imprint of One Weak First-Generation Supernova

Astronomers Publish Evidence of Planetary Collision Around Sun-Like Star

ALMA Finds Interstellar Comet 3I/ATLAS Strikingly Methanol‑Rich With Unusual Outgassing

Gaia Finds Thousands of Solar Twins, Tying the Sun to a Mass Migration Across the Milky Way

Astronomers Tie Distant Star’s Chaotic Fading to Evidence of a Planetary Collision

Eccentric Orbit Confirmed in Neutron Star–Black Hole Merger GW200105

Construction Begins on MOTHRA, a 1,140-Lens Telescope in Chile to Map the Cosmic Web

Magnetar ‘Chirp’ Identified in Superluminous Supernova as Short GRB Localized to Tidal-Stream Dwarf

KM3NeT Study Points to Blazar Population as Plausible Source of Record 220 PeV Neutrino

LIGO–Virgo–KAGRA Unveil Catalog That More Than Doubles Gravitational-Wave Detections

Candidate Ultra-Faint Galaxy in Perseus Appears 99% Dark Matter

Astronomers Map 'Teenage' Planetary System TOI-2076, Revealing Photoevaporation at Work

JWST and ALMA Pin Down Nano-Dominated Dust Around Wolf–Rayet Binary WR 112

Rubin Observatory Goes Live With Real-Time Sky Alerts, Sending 800,000 in First Night

Webb Unveils Layered 'Exposed Cranium' Nebula With Jet-Carved Divide

ALMA Unveils Record 650-Light-Year Mosaic of the Milky Way’s Turbulent Core

Webb Finds Dust-Obscured Red Supergiant Behind 2025 Supernova, a First for the Telescope

New ‘Stochastic Siren’ Uses Gravitational-Wave Hum to Measure the Hubble Constant

New Simulations Show Gravitational Collapse Can Build Kuiper Belt 'Snowman' Worlds