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

What we know about the search for ‘Planet Nine’ in our solar system - The idea of a massive undiscovered planet has been around since before the discovery of Pluto in the 1930s ...

The newly discovered world — a "sednoid" — challenges what planetary scientists thought they knew about the edge of the solar ...

A rare celestial object beyond Neptune, 2020 VN40, moves in sync with Neptune, offering new insights into the outer solar system and fueling the search for Planet Nin ...

NASA's Solar Dynamics Observatory captured a rare solar eclipse on July 25, 2025, during which 62% of the sun was blocked by ...

The newly released images from a December flyby are so detailed that scientists can see explosions and the flow of solar winds.

Pluto reaches opposition and is ready for those who want to chase it down. Use the biggest scope you've got, or take aim with ...