Stephen Hawking

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Across
  1. 1. The red planet
  2. 4. Something without an end
  3. 6. The planet we live on
  4. 7. A path around a star or planet
  5. 9. A distant, bright space object
  6. 10. A cloud of gas in space
Down
  1. 2. Someone who writes books
  2. 3. An icy object that orbits the sun
  3. 5. What comes after the present
  4. 8. A branch of physics