"For the first time, we have identified the earliest moment when planet formation is initiated around a star other than our sun." ...

These incredible images reveal the exact moment when planets began to form around a star 1,300 light-years from Earth.

A monster exoplanet as big as 10 times the size of Jupiter has emerged from the stellar gas and dust surrounding a young star ...

Some planets take the expression "you're your own worst enemy" to the extreme. At least, that's what astronomers found when ...

Artist's impression of Planet Nine – a suspected “wide-orbit” planet – with the Sun in the distance; Neptune's orbit is shown as a small ellipse around the Sun. Imagine a giant planet drifting far ...

With the aid of NASA's exoplanet-hunter TESS, citizen scientists have discovered a new gas giant that is cool, literally and figuratively.

This artist’s concept depicts one of the solar system’s inner planets slamming into Earth after being nudged on a collision course by a passing star. Such a world-shattering cataclysm is ...