Interstellar comet 3I/ATLAS reappears after passing behind the sun

Technology Nov 04, 2025

Interstellar comet 3I/ATLAS has reappeared after slipping behind the sun, and was first spotted again on October 31, 2024.
It swung by just inside Mars's orbit—about 130 million miles from the Sun—during its closest approach.

How to spot the comet

Right now, you can catch 3I/ATLAS low in the eastern sky before sunrise as it moves northward through November.
If you have a small telescope and clear skies, keep an eye out—it'll climb higher over the week, making it easier for bigger telescopes to track.

Why is this comet special?

Shooting through space at over 209300km/h, this visitor comes from beyond our solar system.
Billions of years of cosmic radiation have given it a crust loaded with carbon dioxide, letting scientists peek into its ancient, interstellar chemistry.