Space Exploration

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Across
  1. 5. Force that keeps planets in orbit.
  2. 6. A celestial object with a tail.
  3. 8. The path an object takes around another.
  4. 10. An instrument for observing distant objects.
  5. 14. Astronauts working outside a spacecraft.
  6. 15. A space traveler.
Down
  1. 1. Space telescope named after an astronomer.
  2. 2. NASA's moon landing program.
  3. 3. Reusable spacecraft.
  4. 4. An object orbiting a celestial body.
  5. 7. The Red Planet.
  6. 9. Propels spacecraft into space.
  7. 11. A cloud of gas and dust in space.
  8. 12. A massive system of stars, gas, and dust.
  9. 13. Related to the sun.