Star Vocabulary

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Across
  1. 7. a ring-shaped nebula formed by an expanding shell of gas around an aging star
  2. 8. stars with a supergiant luminosity class
  3. 9. the magnitude of a celestial object as it is actually measured from the earth
  4. 12. the brightest star in Ursa Minor; at the end of the handle of the Little Dipper; the northern axis of the earth points towards it
  5. 13. fusion a nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy
  6. 14. a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass
  7. 17. a region of space having a gravitational field so intense that no matter or radiation can escape
  8. 19. a very large star of high luminosity and low surface temperature
  9. 20. known as the Dog Star or Sirius A is the brightest star in the earth's night sky
Down
  1. 1. a small very dense star that is typically the size of a planet
  2. 2. the magnitude of a celestial object as it would be seen at a standard distance of 10 parsecs
  3. 3. a system of two stars in which one star revolves around the other or both revolve around a common center
  4. 4. a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter
  5. 5. a series of star types to which most stars belong
  6. 6. gaseous cloud from which, in the so-called nebular hypothesis of the origin of the solar system, the sun and planets formed by condensation
  7. 10. a contracting mass of gas which represents an early stage in the formation of a star, before nucleosythesis has begun
  8. 11. a coherent, typically large body of matter with no definite shape
  9. 15. a celestial object, thought to be a rapidly rotating neutron star, that emits regular pulses of radio waves and other electromagnetic radiation at rates of up to one thousand pulses per second
  10. 16. a celestial object of very small radius and very high density, composed predominantly of closely packed neutrons
  11. 18. any of certain groupings of stars that were imagined