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

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.

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 ...

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 ...

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 ...

This voice experience is generated by AI. Learn more. This voice experience is generated by AI. Learn more. A new comet barreling toward the sun could turn out to be a truly ‘Great Comet’ in April — ...

Astronomers analyzed the vapors coming off the comet when it neared the sun and found it had a lot of "heavy" water. That hints it grew up in a frigid planetary system, possibly before its home star f ...