Astronomers are testing a quieter way of searching for moons beyond the solar system, using careful measurements of motion ...

A new discovery suggests the possibility of an exomoon with an unprecedentedly large mass, thousands of times larger than any ...

That would make it thousands of times more massive than any moon orbiting a solar system plane  — so massive it could make ...

The planet HD 189733 b was discovered in 2005, as one of many huge gas worlds snuggled tightly against their suns. It gradually gained popularity for .

From a distance, it looks like a serene blue twin of our own world, a dot that could almost pass for Earth in a telescope ...

It looks like a sapphire jewel in space, but HD 189733bis anything but serene. With winds reaching seven times the speed of ...

Planets usually stay close to stars, moving in neat paths for billions of years. Yet some worlds break free and travel alone through the Milky Way. Astronomers call such worlds free-floating planets.

"Our discovery offers further evidence that the galaxy may be teeming with rogue planets." When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Rogue ...

Seán Jordan does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their ...

Billions of years ago, Earth was an uninhabitable rock covered in magma. Scientists are still working to decipher the tale of how it transformed into a blue and green orb teeming with life. However, ...