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  1. Entropy
  2. The Time Machine
  3. Habitable Zone
  4. Strings
  5. Electromagnetic Radiation
  6. Hubble
  7. Saturn
  8. Carl Sagan
  9. Earth
  10. Mars
  11. Appollo 13
  12. Britain
  13. Project Mercury
  14. Space-Scape #1
  15. Marie Curie
  16. Apollo 11