LESSON 11

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Across
  1. 6. conducted spectogrpahic studies in the 1920s
  2. 7. depends on on the observation of the proper notion and doppler shift
  3. 8. is an event when a planet crosses in front of a star as viewed by an obsever
  4. 11. helps in the understanding of the size of the universe
  5. 12. parallax defined as the angle subtended at the object by the semi-major axis of earths orbit
  6. 13. this theory perfectly explains the abundance of helium and hydrogen in the universe
  7. 14. can be determined by the time elapsed since its brith
Down
  1. 1. it makes use of the fact that as a planet moves towads or away from us
  2. 2. the process of determining the distance to star cluster
  3. 3. this theory proposed that there was no beginning to the universe nor there be an end
  4. 4. the age of the universe
  5. 5. it only orbits around the sun and has enough gravity pull itself into spherical shape
  6. 9. is a planet that does not orbit the sun
  7. 10. cmoes from the greek word wanderer