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3I/ATLAS Composition Speed Trajectory Orbit Visibility Tails Cometary Gases Observation Eccentricity Cometary Activity Gas Emissions 2I/Borisov Comet Composition Outgassing 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 3I/Atlas Orbital Mechanics C/2025 R2 (SWAN) Water Ice C/2025 A6 (Lemmon) Brightness Degassing
