Comet 12P/Pons Brooks shows a D/H water ratio matching Earth’s oceans, revealed through ALMA and NASA IRTF observations.

Your unusual chance to see a comet in the sky is here. C/2023 A3 Tsuchinshan-ATLAS was discovered by astronomers in 2023 — and will appear to the naked eye over the next couple weeks.

Known as 12P/Pons-Brooks, the rarely seen comet prone to colorful outbursts could soon be viewed without a telescope or binoculars.

Discovered last month by a telescope in Chile, the comet known as 3I-Atlas is only the third known interstellar object to pass our way.

CAPE CANAVERAL, Fla. — The Hubble Space Telescope has captured the best picture yet of a high-speed comet visiting our solar system from another star. NASA and the European Space Agency released ...

The Hubble Space Telescope has caught its first glimpse of comet 3I/ATLAS. The comet is just the third object humanity has observed entering the solar system from beyond its limits.