Astronomers and amateur stargazers will be in for a treat the last week of February when a seventh planet will join six others in a planetary parade.

A star racing through the Milky Way may have a planet in tow, setting a new speed record for exoplanet systems. Using microlensing, astronomers spotted the pair moving at over 1.2 million mph.

All of Earth's planetary neighbors are about to be visible in the night sky next week – though you may need binoculars to see ...

NASA has confirmed the discovery of a mysterious new planet beyond Neptune, shaking up our understanding of the outer reaches ...

NASA has been monitoring a never-before-seen planet in its solar system, which is eight times the size of Earth.

"The data from the termination shock encounter will be a treasure trove for space physicists worldwide who are eager to ...

Mississippi stargazers will be able to see 4 or 5 planets in the night sky with their naked eye this month. Will you be able ...

Planets will align on Feb. 28 in a semi-rare phenomenon that only occurs every few years. Can you see it in Georgia? Here's ...

Hubble Space Telescope imagery Neptune has revealed that the planet's clouds are disappearing. Credit: NASA Goddard Space ...

Saturn, Venus, Neptune, Uranus, Jupiter, Mars and Mercury will be visible in an uncommon planetary alignment this month.

Planet demographics reveal a puzzling lack of worlds in a certain size range throughout the galaxy F or centuries our solar ...

Trans-Neptunian objects (TNOs) are icy bodies that vary widely in size, from large dwarf planets like Pluto and Eris—each ...