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

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

December 19, 2025

Comet 3I/ATLAS, the third interstellar object ever detected, will swing closest to Earth overnight from Thursday to Friday (Dec. 18 to 19). Here’s how to see it.

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