GRADE 11

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Across
  1. 2. The unit used to measure distance in space.
  2. 5. A system of millions or billions of stars.
  3. 7. The second planet from the sun, known as Earth’s "sister planet."
  4. 8. A celestial body that orbits a planet.
  5. 10. The center of our solar system.
Down
  1. 1. The path that planets follow around the sun.
  2. 3. The planet known as the "Red Planet."
  3. 4. The force that keeps planets in orbit around the sun.
  4. 6. The largest planet in our solar system
  5. 9. The phase of the moon when it is fully illuminated.