On July 1, the Asteroid Terrestrial-impact Last Alert System (ATLAS) detected what was first believed to be an asteroid. As ...

Footage from NASA/ESA Hubble Space Telescope that celebrates 35 years in space. Images of Mars, planetary nebula NGC 2899, ...

Hubble Space Telescope and MAVEN mission have been used to help unravel the mystery of Mars' escaping water. Credit: NASA ...

But over the summer, 3I/ATLAS, has plunged toward the inner solar system—and the fireworks show has begun in earnest. When ...

NASA's Mars rover Perseverance has uncovered rocks in a dry river channel that may hold potential signs of ancient ...

Interstellar object 3I/ATLAS nucleus size remains one of the biggest mysteries in astronomy. Scientists are analyzing ...

I/ATLAS is a fast, ancient interstellar object. Its odd features fuel both scientific study and speculation. On July 1, astronomers detected a strange, fast-moving object racing toward the Sun. Named ...

Urban legend has told us exactly what aliens look like — little humanoid figures with large oval eyes, a tiny mouth and nose ...

UCLA and UC San Diego grad Megan McArthur retires at 54 after two decades with NASA. The space and ocean scientist's work ...

I/ATLAS, interstellar comet or alien spacecraft, to fly by Mars next month, giving European and international spacecraft a rare chance to observe an object from beyond the solar system.

A new image shows the growing tail of a comet from another star system streaking across our solar system. The image of comet ...

CAPE CANAVERAL, Fla. (AP) — Scientists have discovered a gamma ray explosion outside our galaxy that’s not only exceptionally ...