Pluto is no longer a planet, but why did it lose that title? The change came in 2006 from the International Astronomical Union, which wanted a clear definition of what a planet actually is. Before ...

Add Yahoo as a preferred source to see more of our stories on Google. Guests visting the Lowell Observatory in Flagstaff, Arizona during the I Heart Pluto Festival gaze at celestial objects from the ...

Pluto was downgraded from a planet to a dwarf planet in 2006 by the International Astronomical Union. NASA Administrator Jared Isaacman has stated his support for President Trump to take action to ...

NASA Administrator Jared Isaacman wants to put an end to a decades-long debate among scientists. Is Pluto a planet or not? Isaacman says it should be — but it hasn't been one for 20 years. That's ...

The James Webb Space Telescope (JWST) has found the same strange infrared signal on Saturn’s moon Titan and the dwarf planet ...

After a tumultuous week of clashing over the essence of the cosmos, the International Astronomical Union stripped Pluto of the planetary status it has held since its discovery in 1930. The new ...

Claims that our solar system has a 10th planet beyond Pluto are supported by a new findings by German and French astronomers. They calculate that it is bigger than Pluto. In the debate over whether ...