History of Astronomy

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Across
  1. 5. Theory that says Earth revolves around the Sun
  2. 7. group of stars in a pattern or shape
  3. 10. What the Greek word "planet" means
  4. 12. Penzias and _____ discovered background radiation
  5. 13. study of outer space
  6. 14. Galileo observed this planet's moons in detail
  7. 15. scientist who discovered lots of galaxies
Down
  1. 1. shape of planets' orbits
  2. 2. wrote the 3 laws of planetary motion
  3. 3. similar to astronomy, but thinks space directly impacts humans
  4. 4. Theory that says the Earth is the center
  5. 6. motion when a planet seems to travel backwards from our perspective on Earth
  6. 8. Big ____ Theory that explains start of the universe
  7. 9. explained the heliocentric model
  8. 11. The shape of the Earth