Pluto was discovered in 1930 in Arizona, but in 2006 scientists decided to cut Pluto from the planetary line up. Here is why ...

NEW YORK (AP) — A new Tatooine-like planet outside the solar system may orbit two failed stars ... 3 Chinese astronauts docks ...

A giant object that has been lurking in the relative galactic vicinity of the Solar System this entire time has just been unmasked in all its enormous, invisible glory.

Astronomers have found thousands of exoplanets — worlds beyond our solar system. Most of them are in single-star systems, ...

Once the quirky underdog of our solar system, Pluto held planetary status until 2006 ... the time it takes for Pluto to complete one full rotation on its axis, is about 153 Earth hours or 6.4 ...

In a memorable image from the 1977 film "Star Wars," the young hero Luke Skywalker gazes at two suns setting above the ...