Puzzle 42: Stars and Galaxies

123456789101112
Across
  1. 4. – A pattern of stars visible from Earth
  2. 6. – Extremely luminous active galactic nucleus
  3. 8. – Rapidly spinning neutron star emitting beams of radiation
  4. 10. – A massive system of stars, gas, and dust
  5. 11. – Smooth, oval-shaped galaxy lacking distinct arms
  6. 12. – Region of space with gravity so strong not even light escapes
Down
  1. 1. – Explosive death of a massive star
  2. 2. – Type of nebula formed from a dying star
  3. 3. – A luminous ball of gas held together by gravity
  4. 5. – A cloud of gas and dust in space
  5. 7. – Large, cool star in the late stage of its life
  6. 9. – Type of galaxy with arms that wind outward