Until about 300,000 years after the big bang, atoms could not form because the temperature of the Universe was so hot.
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Q42: Helium fusion requires a higher temperature than
Q43: When we look at close objects, we
Q44: The Universe was perfectly homogeneous, or uniform,
Q45: Hubble's law states that the _.
A) most
Q46: The expansion of the Universe is slowing
Q48: Five billion years from now, the hydrogen
Q49: Before the Universe cooled enough for atoms
Q50: If a star were orbiting a black
Q51: The Sun is a population II star.
Q52: Because they do not emit light, it's
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