Unit 2 Vocabulary

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Across
  1. 2. The phenomenon that occurs when the moon blocks the light from the sun (happens during a new moon)
  2. 4. Newton's law that states all bodies in the universe have a gravitational pull directly related to their size
  3. 8. The center of gravity between two bodies
  4. 9. A cool cloud of dust and gas, can be the birthplace of stars and planets
  5. 10. Tool used to measure star distance - the larger the angle, the closer the star
  6. 11. The wobbling of the Earth on its axis
  7. 13. The thought that the sun is in the center of the solar system and all planets revolve around it (supported by Copernicus & Galileo)
  8. 17. The change in wavelength emitted by a body as the body moves (causes Red Shift)
  9. 18. A cool, dark area on the solar surface
  10. 19. Another word for precession
  11. 20. Fuel for stars
  12. 21. Used to measure star mass - a larger star will have a greater gravitational pull
Down
  1. 1. The prevailing theory for the formation of the universe; claims that an impact between two particles 13.7 billion years ago created the entire universe today
  2. 3. The phenomenon that occurs when the sun illuminates the moon from behind the Earth (happens during a full moon)
  3. 5. The process that gives all stars, including the sun, their energy
  4. 6. The apparent backward drift of a planet caused by planets moving at different speeds
  5. 7. The thought that the Earth is in the center of the solar system and all planets and the sun revolve around it (supported by Ptolemy)
  6. 12. States that all galaxies are moving away from each other, proving that the universe is expanding
  7. 14. The motion of Earth that causes the years (ellipse around the sun)
  8. 15. The study of light and its properties
  9. 16. The motion of Earth responsible for day and night