The official number of planets outside our solar system has reached 6,000, according to space scientists. NASA's tally of ...

Is there a ninth planet out there? Why do some astronomers believe it might exist? Here’s what we know so far.

Water once flowed through asteroid Ryugu and possibly in early solar system, Japanese researchers claim Experts have ...

Scientists have found thousands of planets outside our solar system, called exoplanets, throughout the galaxy. This artist’s ...

"The complexity of the exo-Neptunian landscape provides offers a unique window onto the processes involved in the formation ...

Stargazers in the U.S. will witness the razor-thin waning crescent moon rise close to Venus and the bright star Regulus in ...