Chapter 12 Review

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Across
  1. 4. Planets outside of our solar system are called ___________
  2. 6. A small robotic probe that can move on the surface of a planet or moon
  3. 8. Galaxies with older stars and not much gas and dust
  4. 13. Who is the astronomer that stated the planets orbit around the sun is elliptical, the different planets move at different speeds, and that the speed of the planet's orbit depends on its distance from the sun
  5. 15. The closest known exoplanet at this time
  6. 18. An object that orbits another object in space
Down
  1. 1. How many phases does the moon have?
  2. 2. The first to state that the earth was the center of the universe
  3. 3. A group of stars that forms a shape or pattern
  4. 5. Galaxies with lots of young stars, gas, and dust
  5. 7. Our own galaxy is called The ___________
  6. 9. The idea of making life possible on other planets
  7. 10. Who was the first to use a telescope to study stars?
  8. 11. The time it takes the moon to orbit the earth once
  9. 12. Galaxies with middle aged stars and clouds of gas and dust
  10. 14. The earth's only natural satellite
  11. 16. A device used to explore or examine
  12. 17. Who was the first to prove that the earth wasn't the center of the universe and that the sun, moon, and earth are all round?