Comets are small, roundish bodies made of dust grains mixed with ice. Most travel along elliptical orbits that occasionally ...

NASA advises looking toward the eastern sky before sunrise, particularly in mid to late April, when the comet will pass through constellations such as Pegasus and Pisces. Observers in the Southern ...

Interstellar comet 3I/ATLAS was almost called 3I/Rubin, after researchers found that the giant survey telescope ...

The presence of deuterium, an isotope of hydrogen, in 3I/ATLAS suggests the interstellar comet formed in a much colder place before our solar system existed.

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. This voice experience is generated by AI. Learn more. This ...

A medieval monk may have beaten Edmond Halley to one of astronomy’s greatest discoveries by nearly 700 years. Researchers say ...

In a stunning stroke of luck, Hubble witnessed a comet splitting apart almost in real time. The rare observation is giving ...

Measurements of this interstellar comet’s molecular makeup show an excess of heavy water molecules that is dramatically different from anything known to have ever formed around our sun ...

A rare comet from another star system is revealing just how different alien solar systems may be from our own.