At some point, the cloud collapsed—possibly because the shockwave of a nearby exploding star caused it to compress. Finally the pressure caused by the material was so great that hydrogen atoms began to fuse into helium, releasing a tremendous amount of energy. Even though the Sun gobbled up more than 99% of all the stuff in this disk, there was still some material left over.


Rocky planets, like Earth, formed near the Sun, because icy and gaseous material couldn’t survive close to all that heat. Asteroids in the asteroid belt are the bits and pieces of the early solar system that could never quite form a planet. In fact, it is the study of asteroids and comets that allows scientists to piece together this whole long story.


Finally some of these objects became big enough to be spheres—these spheres became planets and dwarf planets.



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