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How can the formation of the solar system be explained using a scientific theory when no one was able to witness its formation?
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Answer: Nobody really knows it's all speculation
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The most widely accepted theory of planetary formation, known as the nebular hypothesis, maintains that 4.6 billion years ago, the Solar System formed from the gravitational collapse of a giant molecular cloud which was light years across. Several stars, including the Sun, formed within the collapsing cloud. This theory states that the solar system developed out of an interstellar cloud of dust and gas, called a nebula . Most likely the next step was that the nebula flattened into a disk called the Protoplanetary Disk ; planets eventually formed from and in this disk.
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