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In order for a clump of matter in a gas cloud to become a star, it must be a whopping BIG gas cloud, so that the mutual gravitation of the cloud would cause it to collapse in on itself.

There are some theories that a large and diffuse gas cloud would be unlikely to spontaneously collapse under its own gravity without some substantial shock to the gas cloud. The shock wave of a nearby supernova explosion would not only provide the shock, but also contribute a substantial amount of newly-created heavy elements to the system. Such a supernova five billion years ago probably provided a lot of the iron, gold and uranium to our solar system, and also caused our stellar nebula to collapse, forming our Sun and our planetary system.

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