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Observational Astronomy

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Mercury Brightens in Predawn Sky as It Approaches Greatest Elongation

The early-August elongation offers the clearest pre-sunrise viewing and sets up a close Mercury–Jupiter pairing around Aug. 15.

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VLT Observations Show Black Hole Drives Dense Winds Late in Outburst

ALMA Data Open Millimeter Band as New SETI Search Frontier

Wandering Supermassive Black Hole Seen Shredding Star in Galaxy Outskirts

Asteroid 44 Nysa Is Likely a Three‑Lobed Body and Has a Small Moon

Astronomers Capture Clearest Image Yet of Betelgeuse’s Likely Companion

Hubble Study Finds Andromeda’s Star Formation Has Fell to a Fraction of Its Former Rate

AI Flagged a Wandering Supermassive Black Hole Tearing Apart a Star

ALMA Archival Search Recasts How Many Stars We've Searched for Alien Signals

Astronomers Report Jupiter‑Mass Companion Orbiting Brown Dwarf in CD‑35 2722 System

Massive Gaseous Companion Detected Orbiting Brown Dwarf in CD-35 2722

Simulations Suggest Milky Way Disk Flipped After Ancient 'Gaia Sausage' Collision

Astronomers Identify Candidate Binary Supernova Pair Near Jellyfish Nebula

Long-Tracked Near‑Earth Object 1998 SH2 Reclassified as Comet

Hubble and Webb Pin Down First Stellar Black Hole in Omega Centauri

Venus Slides Past Regulus in a Weeklong Evening Show and Returns Near the Crescent Moon Next Week

Nearby Super‑Earth GJ 3378b Confirmed in Red Dwarf Habitable Zone

Webb Reveals Dust-Shrouded Heart of Centaurus A

Euclid Finds 31 Primordial Quasars, Including Two New Distance Records

Apophis Declared Safe for 2029 Flyby as Global Visibility Maps Are Released