First there is a Nebula of hot gas and dust from a super nova explosion. (Particles) As cloud cools, atoms move slower and clump together. Results of planetestimal accretion begins, small objects collide and stick together to form larger bodies. Protoplanet, big enough to pull more in, as it almost becomes a planet. Stays as a protoplanet because Jupiter pulls it to its orbit. Finally it was discovered by Galilieo's satellite and was named Io.
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I like how you described the formation of IO because you described in deep detail on how it was formed and the proces. One thing I think you could add is the picture because i've read it and its great but you needed a picture of how IO was formed and i didn't see one. When was it discovered off of Galilieo's satellite.
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