A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and Earth. The authors dubbed it Planet Y.

In this curious film, a pair of friends venture out into the desert to build an accurate to scale model of our solar system.

IMAP mission will explore our solar system's protective heliosphere and will also help us develop a better understanding of ...

A NASA mission, IMAP, and two more spacecraft that will study space weather are traveling through space atop a single SpaceX ...