How Big Is the Sun?

How Big Is the Sun? One million Earths could fit inside the sun. The sun lies at the heart of the solar system, where it is by far the largest object. The sun was born about 4.6 billion years ago. Many scientists think the sun and the rest of the solar system formed from a giant, rotating cloud of gas and dust known as the solar nebula. As the nebula collapsed because of its gravity, it spun faster and flattened into a disk. Most of the material was pulled toward the center to form the sun. The sun has enough nuclear fuel to stay much as it is now for another 5 billion years.
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