Physics Crossword

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Across
  1. 2. When something is not moving
  2. 4. A substance that a wave passes through
  3. 6. Places in space so strong not even light can escape
  4. 7. A white dwarf that has been cooled down in temperature
  5. 8. A speeding-up change in speed
  6. 9. The way an object is going
Down
  1. 1. A push, pull or twist
  2. 3. The start of a star
  3. 5. A slowing down in speed