-Scientists have identified an object about 435 miles (700 km) wide inhabiting the frigid outer reaches of our solar system that might qualify as a dwarf planet, spotting it as it travels on a highly ...

Since Pluto was relegated to dwarf planet status, almost everyone has agreed that there are eight planets in our solar system. However, it might be time to rewrite the textbooks.

American astronomers have discovered a new dwarf planet at the edge of the solar system, which has already been named 2017 OF201. This object is known to have a huge orbit and a potential size, close ...

What can white dwarf stars eating their own planets teach astronomers about planetary and solar system formation and ...

What's special about Chiron's rings is that they're still forming; this marks the first time astronomers have ever seen a ...

Astronomers have discovered a fascinating new object orbiting a small red star not far from Earth — a brown dwarf with powerful storms and cloudy weather patterns. The discovery, made with the help of ...

More than 2 billion kilometers farther from the sun than Pluto, a frigid world named Makemake sports the most distant gas ever seen in our solar system, new observations reveal. “By surprise, we found ...

In approximately 5 billion years, the sun will deplete its hydrogen fuel and collapse under its own gravity, becoming a white ...

On August 24, 2006, our solar system lost a planet. It wasn't by cataclysmic destruction, but rather by the vote of the International Astronomical Union, which declared that Pluto, considered the ...