Washington, DC— Our galaxy’s most abundant type of planet could be rich in liquid water due to formative interactions between ...

Uranus’s tiny moon Ariel may have had a subsurface ocean that made up around 55% of its total volume. By mapping craters, ...

Amazing views of Jupiter over the years via the Hubble Space Telescope. The moons of Io, Ganymede and hazy Uranus can be ...

Follow the space program since the moon landing in the four-part documentary "Once Upon a Time in Space". Here’s how to watch ...