WCHS Week 7 - Galaxies, Doppler Shift & Hubble's Law (v1)

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Across
  1. 2. The idea that all galaxies began in one location and are receding from each other.
  2. 4. This type of galaxy is small and contains only a few million to a few billion stars.
  3. 5. This type of galaxy is usually reddish to yellowish because they contain mostly old stars.
  4. 6. This is the term used to indicate that absorption spectrum bands are shifted - indicating a doppler effect for a longer than anticipated wavelength.
  5. 8. The force causing the rate of expansion of the universe to increase.
  6. 10. The brightness from these stellar explosions is helpful in determining distances that are very far away.
  7. 11. This type of galaxy is a flat disk with a bulge in the middle and arms that extend outward.
  8. 13. This galaxy is our closest neighbor.
  9. 14. The pulsation period of these stars allows us to measure the distance to other nearby stars.
  10. 16. This is the term for our galaxy’s two satellite galaxies that can be seen in the southern hemisphere.
  11. 18. This object is in the center of the Milky Way Galaxy.
  12. 19. This is the galaxy we call home.
Down
  1. 1. The grouping of all the galaxies known and unknown.
  2. 3. This is the distance light can travel in 365 days.
  3. 7. This phenomenon occurs when wavelength and frequency are varied because an object is moving toward or away from the observer.
  4. 9. A very large group of stars.
  5. 12. This type of galaxy is likely to form due to collision or gravitational interaction with another galaxy, causing a distorted shape.
  6. 15. This states that if a galaxy is further away from us, it will be moving with a greater velocity.
  7. 17. A group of planets around a star.