The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

It took two years for NASA's OSIRIS-REx space probe to return from asteroid Bennu before dropping off a small capsule as it ...

Starting up again Saturday, a sweeping view of our solar system will glow in the night sky. The planetary alignment, or a ...

Six of our cosmic neighbors are expected to line up across the night sky tonight, in what has been dubbed a "planetary parade ...

The enormous visitor to our solar system may have been about 8 times the mass of Jupiter, and come nearly as close to the sun ...

"This is the most powerful volcanic event ever recorded on the most volcanic world in our solar system — so that's really saying something." ...

Stargazers will be treated to a dazzling six-planet "alignment" this January.

Mars, Venus, Jupiter and Saturn should be visible to the naked eye, but get a telescope and you can spot Neptune and Uranus.

In the depth of winter, a sweeping view of our solar system will glow in the night sky. In total, six planets will be visible ...

Samples of asteroid Bennu contain molecules that suggest the "conditions necessary for life" were widespread across the early ...

HWO will be the first space telescope built to find potentially habitable planets and analyze their atmospheres for signs of ...

NASA scientists found amino acids, key minerals, and nucleobases for DNA in samples from the OSIRIS-REx asteroid mission.