– Gavriel, age 10, Paducah, Kentucky A cloud of collapsing gas created our Sun, the first thing to form in our solar system. This happened about 4½ billion years ago.

New studies offer a clearer picture of how the outer solar system formed and evolved based on analyses of trans-Neptunian objects (TNOs) and centaurs. The findings reveal the distribution of ices ...

Brown, Rein and Malhotra think that sometime during the Solar System’s formation, an uninvited guest anywhere between 2 and 50 times the mass of Jupiter barged in fast enough to both shift the ...

This process, called accretion, is how everything in the solar system – planets, moons, comets and asteroids – came into being.

– Gavriel, age 10, Paducah, Kentucky A cloud of collapsing gas created our Sun, the first thing to form in our solar system. This happened about 4½ billion years ago.