3I/ATLAS Composition Outgassing Chemical Composition Speed 3I/Atlas Water Ice Brightness Degassing Trajectory Orbit Visibility Tails Cometary Gases Observation Eccentricity Cometary Activity Gas Emissions 2I/Borisov Comet Composition Size and Composition Cometary Nucleus Carbon Dioxide Composition Carbon Dioxide Ice Mass and Size Carbon Dioxide Ratio NASA Findings Tail Behavior Nickel and Iron Abundance Orbital Mechanics Anti-Tail C/2025 R2 (SWAN) C/2025 A6 (Lemmon) Mass Loss Nucleus 3I/ATLAS Jets Tail Hydroxyl Molecules Non-gravitational Acceleration Hyperbolic Orbit Color Changes Formation
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Fresh multi‑wavelength data highlight unusual chemistry with a sunward anti‑tail, reinforcing NASA’s view of a natural, harmless visitor.
