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The sun formed several billion years ago from a cloud of gas and dust called a nebula. The cloud was mostly composed of hydrogen along with some helium and small amounts of other elements. The nebula collapsed as a result of gravity and possibly the shock wave from a supernova. Several discrete pockets formed that heated as they collapsed and pressure increased. The heat and pressure eventually ignited nuclear fusion, which released huge amounts of energy, thus forming this sun and several other stars. The fusion in the cores of these stars continues to this day. Some of the heavier material in the nebula clustered together to form planets, comets, and other such objects.

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Lydia Schulist

Lvl 13
2y ago

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