Unit Two Vocab Crossword

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Across
  1. 2. an uninterrupted band of light
  2. 3. a system of galaxies containing several to thousands of member galaxies
  3. 5. the apparent change in frequency of electromagnetic or sound waves caused by the relative motions of the source and the observer
  4. 7. a star that falls into the main sequence category on the H–R diagram
  5. 8. a star that has exhausted most or all of its nuclear fuel and has collapsed to a very small size
  6. 12. moving towards the blue end of the spectrum; closer
  7. 14. a law that states that the galaxies are retreating from the Milky Way at a speed that is proportional to their distance
  8. 15. very large, very bright red giant star
  9. 20. an apparent group of stars originally named for mythical characters
  10. 23. brightness of a star when viewed from Earth
  11. 24. a collapsing cloud of gas and dust destined to become a star
  12. 25. shows the relationship between the absolute magnitude and temperature of stars
  13. 26. one of two stars revolving around a common center of mass under their mutual gravitational attraction
  14. 28. moving towards the red end of the spectrum; further away
  15. 29. the study of the properties of light that depend on wavelength
Down
  1. 1. about 13.7 billion years ago, a violent explosion occurred, hurling this material in all directions
  2. 4. a star whose brightness varies periodically because it expands and contracts
  3. 6. a source that radiates short bursts or pulses of radio energy in very regular periods
  4. 9. apparent brightness of a star if it were viewed from a distance of 32.6 light-years
  5. 10. series of bright lines of particular wavelengths
  6. 11. spectrum looks like it has dark lines superimposed
  7. 13. a large, cool star of high luminosity
  8. 16. a group of stars, dust, and gases held together by gravity
  9. 17. the arrangement of electromagnetic radiation according to wavelength
  10. 18. a star that explosively increases in brightness
  11. 19. the distance light travels in a year, about 9.5 trillion kilometers
  12. 21. slight shifting of the apparent position of a star due to the orbital motion of Earth
  13. 22. an exploding massive star that increases in brightness many thousands of times
  14. 26. a massive star that has collapsed to such a small volume that its gravity prevents the escape of everything, including light
  15. 27. a star of extremely high density composed entirely of neutrons