Some of the oldest terrain on Venus, known as tesserae, hint at past volcanic activity. Is that what made the planet the "hellish" place it is today?

Jupiter's moons are pretty hot, at least hotter than they should be, given how far away they are from the sun. A new study explains why that may be.

The building blocks of our planet may have been the source of water on Earth rather than comets or asteroids from faraway, researchers report.

Seismologists used data from NASA's InSight Lander to get measurements deep within Mars. What they learned might clarify planetary formation.

The chemical reactions that dust storms on Mars cause indicate that our quest to find life on the red planet may need to go beneath the surface.

A new kind of "mini rover" moves in could go places that other wheeled rovers couldn't, such as up a sandy hill.

Tiny nanocardboard probes that weigh less than a fruit fly could levitate through the Martian skies to gather data.

The exoplanet Fomalhaut-b likely never was, say astronomers. Their work suggests an expanding cloud of dust instead.

Saturn is far from the sun, so why is its upper atmosphere so hot? Astronomers may have finally solved "one of the great mysteries of planetary science."

New research digs into the red planet's past to figure out where water on Mars actually came from.