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The Sun is so big that about 1.3 million Earths could fit inside it.

The Sun is so big that about 1.3 million Earths could fit inside it.

The Sun holds about 99.8% of all the mass in our Solar System. It's a giant ball of hot glowing gas, and its gravity is what keeps every planet circling around it.

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More facts about Sun Moon Stars

The Sun is a giant ball of hot, glowing gas. The Sun is a giant ball of hot, glowing gas. The Moon has no light of its own — it reflects the Sun. The Moon has no light of its own — it reflects the Sun. Stars twinkle because their light wobbles through our air. Stars twinkle because their light wobbles through our air. The Moon's shape seems to change a little each night. The Moon's shape seems to change a little each night. The Sun is really a star, just very close to us. The Sun is really a star, just very close to us.