science

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Author:
8thgradeclass
ID:
219506
Filename:
science
Updated:
2013-05-13 22:17:43
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test
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ch.24
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  1. What are recognizable patterns of stars called?
    constellation
  2. What is a stars actual brightness called?
    absolute magnitude
  3. What are the distances to stars usually measured in?
    light-years
  4. What are very large stars with masses equal to hundreds or thousands of our sun's mass called?
    super giants
  5. What two properties of stars does a Hertzsprung-Russell diagram consider?
    temperature and luminosity
  6. On what does most stars on the Hertzsprung-Russell diagram fall?
    main sequence
  7. What occurs when a star experiences a huge explosion often destroying it?
    super nova
  8. What is an unimaginably dense collapsed star from which no light escapes?
    black-hole
  9. What is the apparent change in position of distant object as one's viewing positions changes?
    parallax
  10. What is a violent nuclear explosion, producing a temporary bright flash?
    nova
  11. What is another name for the North Star?
    Polaris
  12. What is a cloud of dust or gas that can be seen against a background of stars?
    Nebula
  13. Who published his first New General Catalogue (NGC), listing 130,000 nebulas and other non-stellar objects?
    Johan Dreyer
  14. What are double stars that revolve around each other?
    binary stars
  15. What is a group of stars that are close enough to be held together by gravity and have the same proper motion?
    star cluster
  16. What is a spherical region of space filled with thousands of closely spaced stars?
    globular cluster
  17. What are loose mass of many billions of stars, dust, gases,etc.?
    Galaxies
  18. What type of galaxy is the Milky War?
    Barred spiral galaxy
  19. What are the largest galaxies?
    elliptical galaxies .
  20. What type of galaxy doesn't have any regular pattern or shape?
    Irregular galaxy
  21. Who first proposed the Big Bang Theory?
    Georges Lemaitre
  22. What is a hot, dense collection of matter that becomes a star when nuclear fusion begins?
    protostar
  23. Who proposed the idea of red shift?
    Dr.Hubble
  24. What is the study of the universe?
    cosmology
  25. What is the brightest star in the sky?
    Sirrus
  26. What are the two kinds of motion that describes stars' real motion?
    radial and proper
  27. What are stars that change in brightness because they expand and contract?
    Cepheid Variables
  28. How far away is the Earth from the center of the Milky Way?
    25,000 light-years

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