Big Bang Crossword

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Across
  1. 1. The element that makes up 24% of matter everywhere in the universe
  2. 3. The name of the substance that was entirely created at the time of the Big Bang
  3. 4. The last name of the person who discovered the universe is still expanding
  4. 6. The directions that the universe expands in
  5. 7. The element that makes up 75% of matter everywhere in the universe
Down
  1. 2. A phrase that defines microwave background radiation
  2. 5. 13.7 ______________ years ago was when the Big Bang happened.