Scientists have recently made a groundbreaking discovery by capturing the sounds of Earth’s “heartbeat” from space. This ...

But it’s not just looks. Rocky composition, general size, orbital behaviors—a lot of those qualities can be the same on both ...

Moons that escape the gravity of their host planet and go solo can be called many things, and their label often depends on how large they are.

They weren’t captured with a microphone: Audible sound can’t travel through space, so Voyager was listening to the electromagnetic waves around the planets and moons.

If giant planets in other star systems lose their moons, the freed objects could become “ploonets,” and current telescopes may be able to find them.

The first astronomer to discover moons around Jupiter was Galileo, back in the year 1610, but astronomers are still finding more and more moons around this gas giant.

After the discovery of 12 new moons, the gas giant now has 92 known natural satellites—and scientists expect to find more ...

Explore the definition of a planet and why moons don't necessarily qualify a celestial body as one.

New Neptunian moons–one bright, one faint With this new discovery, the planet Neptune now has 16 known satellites.