Studying the Sun and Beyond our Solar =-System

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Across
  1. 3. a sudden brightening of a star
  2. 5. a group of galaxies
  3. 6. the remnants of supernova events
  4. 10. the distance light travels in a year
  5. 11. large groups of stars, dust, and gases held together by gravity
  6. 12. dense objects with gravity so strong that not even light can escape their surface
  7. 13. the theory that everything started in a small condensed spot
  8. 15. galaxies are retreating from us at a speed that is proportional to their distance
  9. 16. shows the relationship between the absolute magnitude and temperature of stars
  10. 17. a group of very bright stars
  11. 18. used to designate an area of the sky that contains a specific pattern of stars
Down
  1. 1. the remains of low-mass and medium-mass stars
  2. 2. a developing star not yet hot enough to engage in nuclear fusion
  3. 4. very large stars
  4. 7. stars with masses four times that of the sun that then end in a brilliant explosion
  5. 8. a spinning neutron star that appears to give off pulses of radio waves
  6. 9. a sequence of stars that fall along a band
  7. 14. a pair of stars that are pulled towards each other by gravity