The beginning

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Across
  1. 4. – Everything that exists
  2. 6. – Large group of stars
  3. 7. – Objects that orbit stars
  4. 9. – Force that pulls things together
Down
  1. 1. – Tiny, hot point before the Big Bang
  2. 2. – The beginning of the universe
  3. 3. – What everything is made of
  4. 5. – The universe is still doing this
  5. 8. – Hot glowing balls of gas