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Stars twinkle because their light wobbles through our air.

Stars twinkle because their light wobbles through our air.

A star's light passes through moving air before it reaches us. The wiggling air makes the star seem to sparkle and blink.

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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. 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.