Interstellar Comet 3I/ATLAS Makes Closest Approach to Earth on December 19, 2025 — How to See It and Why It Matters
Interstellar comet 3I/ATLAS will pass Earth at about 170 million miles on December 19, 2025, nearly twice the distance to the Sun. Discovered in July by the ATLAS telescope in Chile, the comet is moving too fast to be bound to the Sun. NASA confirms there is no risk to Earth. The object is the third confirmed interstellar visitor after 1I/ʻOumuamua and 2I/Borisov.