From Stardust To Planets: The Beginning Of A Solar System. According to Popular Science, roughly 4.5 billion years ago, a massive cloud of gas collapsed under its own gravity, forming our Sun.This ...

A cloud of collapsing gas created our Sun, the first thing to form in our solar system. This happened about 4½ billion years ago.. Then the planets began to emerge, as the billions of particles ...

Don't worry though—it's not like one planet simply fell out of the solar system. We'll explain what happened and also show you some tricks for remembering the order of all of the planets that ...

Our order of the solar system mnemonics were forever ruined when poor Pluto was unceremoniously booted out of the planetary club back in… actually, we're not telling you the year, because that's ...

A new photo of the solar system's planets has been taken by NASA's Messenger probe. Messenger is headed for Mercury and took a planet family portrait that includes six of the eight major planets.

This process, called accretion, is how everything in the solar system – planets, moons, comets and asteroids – came into being. Telescopes can see young solar systems being born.