SMRTR Science & EngineeringOct 30, 2025Live Science

NASA spacecraft reveal interstellar comet 3I/ATLAS brightened rapidly as it swooped behind the sun

SMRTR summary

Interstellar comet 3I/ATLAS rapidly brightened to magnitude 9 as it swung behind the sun toward perihelion, with NASA and NOAA spacecraft tracking its path while hidden from Earth-based telescopes. This rare third-known interstellar visitor, traveling at record speeds exceeding 130,000 mph, will reappear to ground observers in December.

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