Crossword puzzle

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Across
  1. 3. There are eight planets in our ___________.
  2. 8. The Moon continues to _____ the Earth.
  3. 9. A person who is trained to travel in a spacecraft
  4. 10. The invisible force that attracts any two objects with mass towards each other
  5. 11. _______ is the solar system's largest planet
Down
  1. 1. There are eight of these in our solar system.
  2. 2. A small, rocky, or metallic object that orbits the Sun
  3. 4. This is the hot star at the center of our solar system.
  4. 5. A tubular instrument used for viewing distant objects like ones in space.
  5. 6. The Earth has 1 of these, while Saturn has 274.
  6. 7. This planet is referred to as the "Red Planet."