Remember 3I/ATLAS? Yes, the interstellar comet that made plenty of headlines in 2025 is still romping through our solar system.

Before we say goodbye to our interstellar visitor, another close encounter is on its way. This one could be course-altering.

Interstellar comet 3I/ATLAS's first reported sighting was on July 1, and it's going to be the closest it's ever been to Earth on Friday. Along the way, it reached several milestones leading up to what ...

“I have never seen such a strong CO2 peak in a comet spectrum,” said Martin Cordiner (NASA Goddard Space Flight Center), describing infrared measurements of interstellar comet 3I/ATLAS taken with the ...

Discover the latest findings on interstellar comet 3I/ATLAS, from rare methane detections to high-resolution Hubble images, as it begins its final exit from our solar system.

If you walk outside tonight, look up and expect to see a green streak across the sky, you're going to see nothing. The comet is around magnitude +7, which means it is roughly five times too faint for ...

SEATTLE — The comet 3I/ATLAS makes its closest approach to Earth on Friday, December 19th, according to NASA. Research Assistant Professor at the University of Washington's Department of Astronomy ...

This month’s highlights range from careful scientific evaluation of speculation surrounding interstellar comet 3I/ATLAS to broader discussions of where life might exist beyond Earth, informed by ...

Is it cropdusting Earth with toxins? When 3I/ATLAS made its fly-by of Earth on December 19, Harvard scientist Avi Loeb wondered if it could’ve delivered an early Xmas present — poison debris raining ...