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

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

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

In 1966, a Nasa scientist called Gary Flandro calculated that there ... It is not just within our Solar System that planet ...

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 ...

Tonight and throughout January, stargazers can see a planetary alignment in the night sky or what some are calling a ...

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

For much of January and February, you have the chance to see six planets in our solar system after dark, although two — Uranus and Neptune — will be hard to see without a telescope or high-powered ...

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

While claims of a “rare alignment” are overblown, you can still see up to six planets in the night sky this weekend. Here's ...

There are 20 amino acids that create the proteins required for life on our planet — and scientists have now found exactly 14 ...

A new study suggests that a close encounter with a massive interstellar object, possibly eight times the mass of Jupiter, may ...