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Answer:
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In the early years, everything was made of gas. This gas, mostly hydrogen and helium, expanded and cooled. Over billions of years, gravity, caused gas and dust to form galaxies, stars, planets, and more.
Answer:
In the early years, everything was made of gas. This gas, mostly hydrogen and helium, expanded and cooled. Over billions of years, gravity, caused gas and dust to form galaxies, stars, planets, and more.