Alien probes could already be hiding somewhere in our Solar System – and our current surveys are nowhere near good enough to ...

Facts about Jupiter's moon Callisto, the third largest moon in the Solar System and the most heavily-cratered object.

The outer solar system once seemed like a quiet backwater. But a glut of tiny, strange moons with unruly orbits are coming ...

Our solar system may have hosted up to six giant planets in its first hundred million years, a new study suggests. The ...

Our solar system has two ice giants, Uranus and Neptune, but there may have been a third. According to a new study published ...

Unlike rocky planets such as Mars and Earth, angrites do not have a lot of silicon dioxide. Because of this, astronomers have ...

Earth’s earliest chapter is mostly gone. Rocks from the planet’s first few billion years have been eroded, buried, recycled, ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. An object has been discovered orbiting the sun far beyond ...

This week's science news.

This small, unassuming mineral may be older than Earth itself. Krotite reminds us of the vast timescales and surprising ...