Earth Science Test Review

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Across
  1. 4. The _______ effect is the apparent change in frequency of a wave in relation to an observer moving relative to the wave source.
  2. 6. When the star moves away from us, its spectrum looks slightly redder. This is called ___.
  3. 8. ________'s Law states that the universe is expanding and that galaxies are moving away from each other.
  4. 10. When a main sequence star begins to run out of hydrogen fuel, the star becomes a ______
  5. 12. the distance from the peak of one wave to the peak of the next
  6. 13. Kepler's _________ Law stated that the planet revolves around the Sun in an elliptical path, with the Sun occupying one of the foci of the ellipse.
  7. 18. ________'s Law describes how the earth's orbit changes.
  8. 19. counts the number of waves that pass by a given point over a given period of time
  9. 21. When a star explodes and dies, the explosion is called a _________
Down
  1. 1. If a siren is coming towards you, the wavelengths would be ________ than when it is moving away.
  2. 2. The type of galaxy that has no known shape and contains large amounts of new stars.
  3. 3. Stars begin their lives as clouds of dust and gas called a__
  4. 5. The word to describe the path a planet travels around the sun
  5. 7. The type of galaxy that is football shaped, makes up 60% of the galaxies in the universe, and has little to no star formation
  6. 9. The contracting cloud that is formed after the nebula
  7. 11. Stars and gases are held together by
  8. 14. The type of galaxy that contains very old and new stars.
  9. 15. A collection of billions of stars
  10. 16. Kepler's _________ Law states that the closer a planet is to the sun the faster it will orbit.
  11. 17. ________ and Helium are the two elements that are involved in nuclear fusion
  12. 20. Nuclear _____ is the process that happens in the core of the stars where the nuclei of the the atoms join together