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The Moon moves a tiny bit farther from Earth every year.

The Moon moves a tiny bit farther from Earth every year.

The Moon drifts away from us by about 3.8 cm each year — roughly the speed your fingernails grow. Very slowly, this is also making Earth's days a little bit longer over millions of years.

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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 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.