Solar system

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Across
  1. 5. the distance that light travels in one year
  2. 6. a stars brightness the star would have if it were at a standard distance from earth.
  3. 7. all of space and everything in it
  4. 8. a large cloud of gas and dust containing an immense volume of material.
  5. 9. the blue-white core that is left behind cools
  6. 11. a contracting cloud of gas and dust with enough mass to form a star
  7. 12. a more accurate scale of the entire solar system
Down
  1. 1. states that the universe formed in an instant, billions of years ago, in an enormous explosion.
  2. 2. a group of single stars, star system, star clusters, dust, and gas bound together by gravity
  3. 3. a supergiant runs out of fuel, within hours the star blazes millions of times brighter.
  4. 4. a stars brightness as seen from earth
  5. 10. examine