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

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

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

It's not especially remarkable for a few planets to line up in the sky, but the sight of four or five brilliant planets at once is less common, according to NASA. How does the ali ...

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 ...

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 ...

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

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

Mars will be making its closest approach to Earth in two years, and thus, the mighty red planet, named for the god of war ...

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 ...

The building blocks of life could have been delivered to Ceres by one or more space rocks from the outer asteroid belt.

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