Space exploration

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Across
  1. 2. The telescope that orbits Earth
  2. 5. A massive explosion that occurs when a star dies
  3. 6. First person to walk on the moon
  4. 7. The boundary where Earth's atmosphere meets space
  5. 9. The closest star to Earth
  6. 10. The first satellite launched into space
  7. 12. The first human in space
  8. 14. Known as the Red Planet
  9. 15. The largest planet in our solar system
  10. 17. The first reusable space shuttle
  11. 19. The force that keeps planets in orbit
  12. 20. A vehicle used to explore space
Down
  1. 1. A bright streak of light caused by a meteoroid
  2. 3. An astronaut's home in space
  3. 4. The natural satellite of Earth
  4. 8. The study of space and celestial bodies
  5. 11. The time toward which space missions are planned
  6. 13. A scientist who studies space
  7. 16. The galaxy that contains our solar system
  8. 18. The path a planet follows around the Sun