Comet Lemmon will have its closest brush with Earth on or around Tuesday, Oct. 21. Comet SWAN should have its flyby with ...

Looking for a sky event this week? Check out our full Sky This Week column. October 14: Look south for Pluto and M75 Comet ...

Comet Lemmon, discovered earlier this year, will make a close approach to Earth later this month, giving skywatchers the ...

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

Comet Lemon will be in the heart of the constellation Boötes, the Herdsman, as it makes its closest approach to Earth on Oct.

ALMA captures surprising activity in comet C/2014 UN271, Bernardinelli-Bernstein comet, the largest ever detected.

This newly discovered comet could soon glow bright enough for the naked eye as it sweeps through October's morning and ...

The eyes of every astronomer widened this year when an interstellar traveler was discovered in our solar system. Despite some ...

The interstellar comet 3I/ATLAS may be out of view of Earth, but orbiters on Mars were able to recently get a look at it.

3I/ATLAS, an interstellar object currently zipping through the solar system, is capturing the attention of astronomers, the ...

What makes 3I/ATLAS especially intriguing is that the comet might be three billion years older than our entire Solar System.

Harvard professor Avi Loeb discusses the first new images of 3I/ATLAS after it passed Mars. Early photos from international ...