Unit 1 and 2

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Across
  1. 2. Where Stars are born
  2. 3. a circle of white or colored light around the sun, moon, or other luminous body caused by refraction through ice crystals in the atmosphere.
  3. 7. an aggregation of galaxies comprising about 50 or fewer gravitationally bound members
  4. 9. a classification of stars which appear on plots of stellar color versus brightness as a continuous and distinctive band.
  5. 11. unit of length used to measure the large distances to astronomical objects outside the Solar System
  6. 12. an absolute measure of radiated electromagnetic energy per unit time
  7. 13. The middle of a galaxy
  8. 14. any star whose observed light varies notably in intensity.
Down
  1. 1. a type of variable star that pulsates radially, varying in both diameter and temperature
  2. 4. The ejected electrons and protons released from the sun's corona
  3. 5. an extremely luminous active galactic nucleus (AGN).
  4. 6. Large destructive celestial body
  5. 7. a system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity
  6. 8. the collapsed core of a massive supergiant star.
  7. 10. Two stars gravitationally bound to one another