Unit 3: Earth and Space Pre-Test Review

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Across
  1. 1. __ effect: stretching or compressing sound and light waves as they move relative to an observer
  2. 5. Abbreviation for electromagnetic radiation
  3. 7. Objects moving toward observers appear to have shorter wavelengths of color
  4. 9. consists of all three physical dimensions and time as a fourth dimension
  5. 13. Patterns of stars like Orion, Big Dipper, or Cassiopeia
  6. 15. the type of star almost as dense as a black hole
  7. 18. A collection of many star systems held together by immense gravity
  8. 19. Zero ___ = -273.15 degrees Celsius
  9. 20. a black hole at least 100,000 times the mass of our sun
  10. 22. Acceleration due to ___ on earth: 9.8 m/s²
  11. 23. a gigantic explosion that occurs when a high mass star experiences a core collapse
Down
  1. 2. Objects moving away from observers appear to have longer wavelengths of color
  2. 3. __ relativity: space and time are interconnected and affect one another
  3. 4. Most stars have this as their main fuel
  4. 6. Part of why you hear and see static on old TVs and radios: Cosmic __ Background
  5. 8. Big Bang Theory: universe began as an ___ point of superheated matter
  6. 10. When a massive star can no longer do fusion: core __
  7. 11. Radiation that strips electrons from atoms, such as X-rays and gamma rays
  8. 12. The process of combining smaller atoms into bigger ones: nuclear __
  9. 14. a bright, luminous object in the universe, usually resulting from the fusion of hydrogen into helium
  10. 16. a large cloud of gas and dust that may form into star systems
  11. 17. __ relativity: massive objects cause distortions in spacetime
  12. 21. When a star fuses hydrogen into helium: main __