Add Yahoo as a preferred source to see more of our stories on Google. On January 5, 2005, astronomers at NASA discovered Eris, the second-largest dwarf planet in the solar system. Eris is just ...

Some 350 light-years away, the V1298 Tau system features an infant sun-like star, just 23 million years old, orbited by four ...

Planets start as messy clumps of rock and dust. Gravity pulls everything toward the center. Over time, this force smooths out the shape. That is why planets become round. Trump proposes new monument ...

Not all planets are small compared to stars. Some grow so massive they approach stellar size, challenging how astronomers classify objects in space. These extreme worlds blur the boundary between ...

Early versions of the cartoon characters Betty Boop and Pluto have officially entered the public domain, allowing creators to use them freely in video games, films and other creative projects without ...