ALMA reveals unusual “alien” water in interstellar comet 3I/ATLAS, showing it formed in an extremely cold, distant star ...

This artist’s impression compares the semi-heavy water content of the interstellar comet 3I/ATLAS (left) and Earth (right).

Moon goes rogue, logic goes out the window, and somehow it still rules. This sci-fi disaster is dumb, loud, and wildly ...

Comet PanSTARRS recently survived its close brush with the sun. When you purchase through links on our site, we may earn an ...

Measurements of this interstellar comet’s molecular makeup show an excess of heavy water molecules that is dramatically ...

A comet named 3I/ATLAS was first discovered on July 1, 2025, and is located about 420 million miles away from Earth, ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. A brightening comet is now becoming easier to see — and this ...

Comet C/2025 R3 (PanSTARRS) has been getting closer to the Earth and sun as April progresses, and Nevadans could see it at its clearest tomorrow, April 17. The comet is potentially the brightest of ...

A new comet, R3 (PanSTARRS), should be visible to the naked eye in the pre-dawn sky through mid-April. The comet will be visible in the eastern sky near the constellation of Pegasus until about April ...

Usually, comets are dormant blocks of rock and ice. They only wake up when they get close to a star. The intense heat causes their ice to sublimate, flashing directly from a solid into a gas, which ...

A comet named C/2025 R3 (PanSTARRS) is expected to be one of the brightest skywatching events of 2026. Astronomers expect April 17 to be one of the best mornings for viewing in California, depending ...