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Interstellar Comets

3I/ATLAS 3I/Atlas 2I/Borisov Comet 3I/ATLAS Borisov 3I/ATLAS Characteristics 3I/ATLAS Observations Characteristics of 3I/ATLAS Comet Borisov Chemical Composition 1I/Oumuamua 3I/ATLAS Properties C/2025 N1 (ATLAS) 'Oumuamua Tracking Comets 3I/2025 N1 (ATLAS)

Webb Detects Methane on Interstellar Comet 3I/ATLAS

The measurement reveals a carbon-dioxide–heavy chemistry that suggests the comet formed in an environment unlike most Solar System comets.

Interstellar Comet 3I/ATLAS Shows Extreme Heavy-Water Enrichment, Study Finds

JWST Detects Methane From Interstellar Comet 3I/ATLAS

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

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

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

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 to Make Safe Closest Approach Friday at 167 Million Miles

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

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

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’

NASA Unveils Multi‑Mission Views of Interstellar Comet 3I/ATLAS

Radio Detection From 3I/ATLAS Bolsters Natural-Comet Explanation