Space: The Final Frontier

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Across
  1. 1. The distance light can travel in one year.
  2. 4. A machine that moves around a planet to send signals or take pictures.
  3. 5. A huge collection of stars, planets, and space dust.
  4. 7. A big round object in space that moves around a star.
  5. 8. The invisible path an object follows around a bigger object in space.
Down
  1. 2. The force that keeps things from floating away.
  2. 3. A person who explores space in a special suit and spacecraft.
  3. 6. Everything in space, including stars, planets, and galaxies.