Space Exploration

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Across
  1. 1. A system of millions of stars held together by gravity
  2. 3. A large celestial body orbiting a star
  3. 4. A vehicle that can launch into space
  4. 7. An object placed in orbit around the Earth
  5. 8. The act of sending a spacecraft into space
  6. 10. A small rocky body orbiting the sun
  7. 11. An instrument used to observe distant objects in space
Down
  1. 1. The force that attracts objects toward the center of the Earth
  2. 2. A person trained to travel in a spacecraft
  3. 5. A celestial object of ice and dust that develops a tail
  4. 6. A cloud of gas and dust in space
  5. 9. The curved path of a celestial object around another