Chapter 25 vocab

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Across
  1. 2. magnitude, the apparent brightness of a star if it were viewed from a distance of 32.6 light-years; used to compare the true brightness of stars
  2. 4. bang theory, the theory that proposes that the universes originated as a single mass which subsequently exploded
  3. 6. dwarf, a star that has exhausted most or all of its nuclear fuel and has collapsed to a very small size believed to be near its final stage of evolution
  4. 7. star, pairs of stars pulled toward each other by gravity
  5. 10. the slight shifting in the apparent position of a nearby star due to the orbital motion of earth
  6. 11. used to designate an area of the sky that contains a specific pattern of stars
  7. 13. a collapsing cloud of gas and dust destined to become a star; a developing star not yet hot enough to engage in nuclear fusion
  8. 14. a star that explosively increases in brightness
  9. 17. a cloud of gas an/or dust in space
  10. 19. star, a star of extremely high density composed entirely of neutrons
  11. 20. a variable radio source of small size that emits radio pulses in very regular periods
  12. 21. giant, a large cool star of high luminosity; a star occupying the upper-right portion of the H-R diagram
Down
  1. 1. star, a star that falls into the main sequence category on the H-R diagram; This category contains the majority of stars and runs diagonally from the upper left to the lower right on the H-R diagram
  2. 3. A better unit to express seller distance
  3. 5. a group of stars dust and gases held together by gravity
  4. 8. magnitude, a stars brightest as it appears from earth
  5. 9. hole, a massive star that has collapsed to such a small volume that is gravity prevents the escape of everything including light
  6. 11. variable, a star whose brightness varies periodically because it expands and contracts; a type of pulsating star
  7. 12. an exploding star that increase in brightness many thousands of times
  8. 15. law, a law that states that the galaxies are retreating from the Milky Way at a speeds that is proportional to their distance
  9. 16. a group of stars close together
  10. 18. giant, a very large very bright ted giant star