3I/ATLAS is likely an old, active comet about 2 km across, and its high speed implies it formed roughly 3 to 11 billion years ago around a low-metallicity star.
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The Kinematic Age of 3I/ATLAS and its Implications for Early Planet Formation
3I/ATLAS is likely an old, active comet about 2 km across, and its high speed implies it formed roughly 3 to 11 billion years ago around a low-metallicity star.