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 ...

Finally, a family portrait of Pluto is beginning to emerge! For the first time ever, astronomers have captured two never-before-photographed moons orbiting Pluto. NASA's New Horizons spacecraft ...

Pluto lost its planetary status in 2006. Nearly two decades later, people are still arguing about it — and now the argument has reached the White House. NASA Administrator Jared Isaacman told the ...

Debate has raged for two decades over whether Pluto should be considered a planet. Some want President Trump to take action via executive order.

The International Astronomical Union (IAU) announced Tuesday that names voted on by the public had been accepted for Pluto's fourth and fifth moons. Kerberos and Styx, formerly known as P4 and P5, ...