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Outer Solar System

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

A 37-night campaign found precessing jets in a sunward anti-tail, implying a roughly 15.5-hour spin.

First Trans-Neptunian Object Found in 10:1 Neptune Resonance

Discovery of 'Ammonite' Narrows Search for Planet Nine

New Distant Sednoid ‘Ammonite’ Casts Doubt on Planet Nine Hypothesis

Active Interstellar Comet 3I/ATLAS Set for Safe Solar System Passage

Lucy Spacecraft Delivers First Full High-Resolution Images of Asteroid Donaldjohanson