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

An interstellar comet carries water unlike anything in our solar system, revealing a far colder birthplace and clues about ...

Scientists are grappling with a cosmic mystery: why does the Universe behave differently on massive scales compared to our ...

Learn more about the interstellar traveler, Comet 3I/ATLAS, and what researchers know about its place of origin.

The celestial body’s status as the solar system's ninth planet was withdrawn in 2006. Now some experts say we might want to ...

Astronomers surveying the outer solar system have revealed that a rare object far beyond Neptune is moving in sync with the eighth planet in an unexpected way. Called 2020 VN40 and first discovered in ...

Scientists suggest that a fifth, hidden force linked to dark energy may exist in the solar system but has not yet been ...