A long-settled space debate is back in the spotlight after fresh political backing in the United States. Calls to restore ...

President Donald Trump and his NASA administrator are reviving the Pluto debate again — apparently at the urging of “Star ...

Discovered in 1930 at the Lowell Observatory, Pluto was demoted as a planet in 2006. Some want President Trump to take action via executive order.

Since Pluto's discovery in 1930, there have been nine planets in the solar system, but a year ago, scientists at the California Institute of Technology said there were ten. An object they called Xena ...

Arizona – and Flagstaff specifically – has long considered itself the home of Pluto. After all, Percival Lowell, the namesake of the state's most prominent observatory, was not only one of the first ...