SMRTR Science & EngineeringDec 18, 2025Live Science

Comet 3I/ATLAS reaches its closest point to Earth tonight: How to see it in the sky and online

SMRTR summary

Comet 3I/ATLAS, the third interstellar visitor from another star system, reaches its closest approach to Earth at 1 a.m. EST on December 19, coming within 168 million miles of our planet. While visible through large telescopes as a faint greenish patch near star Regulus, NASA's Europa Clipper spacecraft captured better ultraviolet images from just 102 million miles away.

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