A new explanation for the solar system's radioactive elements suggests Earth-like planets might be found orbiting up to 50 ...

Interstellar comet 3I/ATLAS makes its closest Earth approach on Dec. 19, offering astronomers a rare chance to study a visitor from beyond the solar system ...

Comet 3I/ATLAS will get closest to Earth on Dec. 19, and astronomers will be watching.

An eye-catching pattern on the surface of Europa, an ice-covered moon, may have profound implications for our understanding ...

The world's most expensive infrared spectrometer - the James Webb Space Telescope - is unearthing extraordinary exoplanet ...

Carl Sagan famously said that "We're all made of star stuff." But he didn't elaborate on how that actually happened. Yes, ...

Interstellar comet 3I/ATLAS shows odd traits—anti-tail, strange acceleration, unusual chemistry—prompting scientists to warn ...

This week, Earth will get its best chance to steady an interstellar comet as it makes its closest approach to the planet.

Mercury is the innermost and smallest of the eight major planets in our Solar System, orbiting closest to the Sun. Though only slightly larger than Earth’s Moon, Mercury endures some of the most ...

Wondering what 3I ATLAS is all about? Here's what to know as interstellar comet 3I/ATLAS nears Earth this week, when to watch ...

New high-contrast images from SPHERE show a stunning variety of debris disks shaped by collisions of tiny planet-building ...

A mysterious interstellar comet known as 3I/ATLAS is about to make its closest approach to Earth in December 2025. Here's ...