If Earth has a twin there, NASA ought to find it. This is what we take away from a report once a decade that sets out the priorities of...

A recent discovery of sizeable ammonia-rich hail, called mushball, on Jupiter could explain why Uranus and Neptune do not appear to have...

According to a new study, catastrophic floods caused by lake overflows at the beginning of Mars may have created many valleys on the Red...

There's now even more evidence that a bizarre star system perched on the constellation Orion's nose may contain the rarest type of planet...

Two spacecraft built by Europe and Japan captured their first glimpse of Mercury in a weekend flyby, revealing a rocky world covered with...

On Wednesday (September 22), the fall equinox will bring the Earth about 12 hours of daylight, 12 hours of the night, and a renegade...

According to a new study, black holes might be more complex than scientists have thought, which suggests for the first time that these...

We now know where the first-ever NASA moon robot will land. NASA officials announced that the ice-hunting Volatiles Investigating Polar...

New research suggests that Mars was destined to desiccate by its small size. Observations made by robotic explorers such as NASA's...

Two intriguing signals spotted in a small gravitational-wave detector could represent all kinds of exotic phenomena — from new physics to...