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Interstellar Comets

3I/ATLAS 3I/Atlas 2I/Borisov Borisov 3I/ATLAS Characteristics Comet 3I/ATLAS 3I/ATLAS Observations Characteristics of 3I/ATLAS Tracking Comets 1I/Oumuamua

ALMA Maps Show Interstellar Comet 3I/ATLAS Is Exceptionally Methanol-Rich

Peer-reviewed ALMA mapping identifies distinct sources for HCN versus methanol outgassing.

JUICE Releases Best-Yet Image of Interstellar Comet 3I/ATLAS as Data Flow Begins

SPHEREx Detects 20-Fold Post-Perihelion Surge in Interstellar Comet 3I/ATLAS

No Alien Signals Detected From Interstellar Visitor 3I/ATLAS in Green Bank Scan

Radio Search Finds No Signal From Interstellar Comet 3I/ATLAS as Hubble Images Twin Jets

Sun-Facing Tail in Interstellar Comet 3I/ATLAS Reveals Wobbling Jets, Suggesting 15.5-Hour Rotation

EarthSky Names 2025’s Top Stories, Led by Interstellar Comet 3I/ATLAS

Interstellar Comet 3I/ATLAS Makes Closest Pass to Earth at About 168 Million Miles

Interstellar Comet 3I/ATLAS Makes Closest Earth Pass at 270 Million Kilometers

Interstellar Comet 3I/ATLAS to Make Safe Closest Approach Friday at 167 Million Miles

Interstellar Comet 3I/ATLAS Glows Greener Ahead of This Week’s Distant Earth Approach

Gemini North Images Show Faint Green Glow From Interstellar Comet 3I/ATLAS

New X-Ray and Gemini Images Refine View of Interstellar Comet 3I/ATLAS Before Dec. 19 Earth Flyby

Interstellar Comet 3I/ATLAS Shows Faint X-Ray Halo as Safe Dec. 19 Flyby Nears

Hubble and Juice Capture New Views of Interstellar Comet 3I/ATLAS Ahead of Dec. 19 Flyby

Hubble and ESA’s JUICE Return New Views of Interstellar Comet 3I/ATLAS Ahead of Dec. 19 Earth Pass

Interstellar Comet 3I/ATLAS Shows Signs of Global Ice Volcanoes, Study Finds

Interstellar Comet 3I/Atlas Nears Dec. 19 Perihelion on Safe, Distant Track

Interstellar Comet 3I/ATLAS Nears Dec. 19 Earth Flyby as Study Flags Strong Jupiter Perturbation

NASA Publishes Mars-Captured Views of Interstellar 3I/ATLAS as Minority Raises ‘Anomalies’