For years, astronomers have toyed with the idea that the Sun hides an extra planet so distant and dim that even the best ...

This is probably the most convincing evidence for Planet Nine so far. It is believed that this planet is five to ten times ...

An exoplanet is a planet from a different star system. Most known exoplanets orbit stars within the Milky Way, but with the help of powerful space telescopes, scientists have discovered exoplanets ...

A powerful new observatory is the best hope yet for finding the elusive Planet 9, a large planet that some scientists say is ...

In fact, the life that could be – emphasis on the could be – thriving on a distant ocean-covered planet named K2-18b is likely not intelligent at all. But that doesn't make the recent ...