Astronomers may have demoted Pluto from full-fledged planet to dwarf status, but evidence suggests the solar system may still host a mysterious ninth planet — far beyond Neptune, cloaked in shadow and ...

In an unprecedented discovery, astronomers have detected a rare exoplanet located at the very edge of the Milky Way galaxy, using a method grounded in Albert Einstein’s theory of general relativity.

Add Yahoo as a preferred source to see more of our stories on Google. Have you ever seen a planet parade, also known as a planetary alignment? That's when several planets in the night sky line up, ...

Is there a massive undiscovered planet on the outer reaches of the solar system? The idea has been around since before the discovery of Pluto in the 1930s. Labeled as planet X, prominent astronomers ...

A cosmological simulation study by researchers from the Shanghai Astronomical Observatory of the Chinese Academy of Sciences has systematically revealed, for the first time, how the interaction ...

This weekend is the last chance to see any of February’s much-hyped “planet parade” or “planetary parade” before it completely fades from view. While six planets are technically above the horizon ...