science lesson 3

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Across
  1. 2. to observe an object
  2. 6. first stage of planet formation
  3. 7. distance light travels in a year
  4. 8. brightness seen from a fixed point
  5. 9. what happens when supergiants run out of fuel
  6. 10. all space and everything in ti
  7. 12. to figure out
Down
  1. 1. what is left from a blue-white dwarf
  2. 3. brightness seen from earth
  3. 4. group of single stars, stay systems, star clusters, dust, and gas bound by gravity
  4. 5. the explosion that started the universe
  5. 11. large cloud of gas and dust