Two Comets Visible

Two bright green comets are streaming through the skies and are visible to skygazers in the Northern Hemisphere.

Comet Lemmon will have its closest brush with Earth on or around Tuesday (Oct. 21, 2025). The other cosmic snowball, Comet SWAN, should have its flyby with Earth on Monday, but it’s headed away from the sun and will likely grow dimmer as the days pass.

To see the pair, go outside just after sunset and look to the northern sky for Comet Lemmon close to the horizon. Comet SWAN will also be near the horizon, but to the southwest.

The double comets could be visible with binoculars through the end of the month, but experts aren’t yet sure how bright they’ll remain.

The comets are green because of gases streaming off their surfaces. From Earth, they’ll look like gray, fuzzy patches.