Comets are celestial bodies made up of ice, rock, and dust, and they typically range in size from a tens of feet to several miles in length. In the case of 3I/ATLAS, scientists estimate its diameter ...

Stargazers are in for a treat -- a newly discovered comet is visible in the July night sky. Comet Neowise, discovered in late March, is appearing brighter as it approaches the sun, according to ...

New full-color images of interstellar comet 3I/ATLAS capture a rare visitor in vivid detail just days before it makes its closest pass by Earth, revealing a shifting palette of reds and greens that ...

Scientists tracked interstellar comet 3I/ATLAS and found rotating jets in a rare sun-facing tail during its 2025 pass through ...

This year, the October sky could offer a rare spectacle: two comets are expected to become visible simultaneously. The first, discovered recently, follows an extremely long orbit. The second, detected ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. Comet Lemmon (C/2025 A6) may soon make a play for the title ...

If you’ve not seen the two green comets yet, 90 minutes after sunset on Sunday, Oct. 26, is your last best chance before they fade. The brighter Comet Lemmon (C/2025 A6) and much dimmer Comet SWAN ...