LESSON 11

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