Is there a massive undiscovered planet on the outer reaches of the Solar System? The idea has been around since before the ...

A telescope has discovered a new world on the edge of the Milky Way – potentially confirming the ‘Planet X’ theory. Beyond ...

The post Scientists Might Just Have Discovered Another Dwarf Planet Sibling For Pluto first on TwistedSifter. In 2006, Ceres – located in our solar system’s main asteroid belt – was officially ...

A telescope has discovered a new world on the edge of the Milky Way – potentially confirming the ‘Planet X’ theory. Beyond Neptune, a smaller ‘ninth’ planet has been identified in the Kuiper Belt. If ...

In the dark, icy outskirts of our solar system—far beyond Neptune's orbit—astronomers have discovered a cosmic oddball that appears to be locked in an ...

Pluto nearly fills the frame in this image from NASA's New Horizons spacecraft. The image was taken on July 13, 2015, when the spacecraft was 476,000 miles (768,000 kilometers) from the surface.

New Horizons flew by Pluto 10 years ago. Researchers are still unpacking the spacecraft’s insights on the distant, icy world. NASA, JHU-APL ...