Mars's moon Phobos is so strange that no one knows how it formed. But a forthcoming mission could solve this mystery - and a host of other puzzles connected to the solar system's deep past ...

Two exciting new studies detail the life-supporting contents of a 4.3-ounce sample of the asteroid Bennu. The OSIRIS-REx ...

All of our solar system’s planets are lining up to parade through the night sky at once. This extraordinary celestial event will see the sky scattered with seven visible planets in what is known ...

This may explain the strange properties of the orbits of our solar system's planets, which are not quite perfectly circular, and all lie on slightly different planes. NASA artist’s conception of ...

The way people think of the Solar System has changed many times throughout history. Before the development of the telescope, these ideas were based on what could be seen with the naked eye.

MADDIE MOATE: The universe is vast. CHILD: Vast means really, really big! MADDIE: There are a lot of stars in our universe. And the sun is a star that gives out heat and light. The sun is at the ...