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13.8 - 4.6 Billion Years Ago: There was a dust cloud floating in space called stellar dust which is a part of a bigger cloud- nebula. At some point, the cloud collapsed because the shockwave of a nearby exploding star caused it to compress.
4.6 Billion Years Ago: Supernova, an exploding star, sends shockwaves, causing the cloud to collapse. It fell in on itself, creating a disk of material surrounding it. Where the cloud once was, there was solar nebula, a group of swirling material.
4.5 Billion Years Ago: Gravity in the the nebula pulled in matter. The pressure it caused was so great that hydrogen atoms began to fuse into helium, releasing a tremendous amount of energy- creating our sun.
Bits of this material clumped together because of gravity. Big objects collided with bigger objects, forming still bigger objects. Finally some of these objects became big enough to be spheres—these spheres became planets and dwarf planets
Rocky planets, like Earth, formed near the Sun, because icy and gaseous material couldn’t survive close to all that heat. Gas and icy stuff collected further away, creating the gas and ice giants. And like that, the solar system as we know it today was formed
Asteroids in the asteroid belt are the bits and pieces of the early solar system that could never quite form a planet. Way off in the outer reaches of the solar system are comets. These icy bits haven’t changed much at all since the solar systems formation.

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