Maddie Smith - Chapter 28&29 Astronomy

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Across
  1. 4. a theory that our universe began with a primordial explosion some 13.7 billion years ago
  2. 5. mercury,venus,earth,mars are all
  3. 8. hottest planet
  4. 9. what remains when a supergiant star collapses into itself
  5. 10. Jupiter,saturn,uranus,neptune are all
Down
  1. 1. a graph of intrinsic brightness versus surface temperature for stars
  2. 2. a huge assemblage of stars, interstellar gas, and dust
  3. 3. groups of stars with names from antiquity
  4. 6. a cloud of gas and dust
  5. 7. closest planet to the sun