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    Physics & Astronomy
  3. Study Set
    The Essential Cosmic Perspective Study Set 1
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    Exam 17: The Birth of the Universe
  5. Question
    The Observed Composition of Ordinary Matter in the Universe-Roughly 75
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The Observed Composition of Ordinary Matter in the Universe-Roughly 75

Question 4

Question 4

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The observed composition of ordinary matter in the universe-roughly 75 percent hydrogen and 25 percent helium by mass-closely matches theoretical predictions based on the Big Bang model.

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