Review Do Now

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Across
  1. 2. telescope that collects infrared waves in space
  2. 3. developed the first hand-held telescope
  3. 4. earth is part of the ________, or terrestrial planets
  4. 7. the _______ planets are composed of gas and ice
  5. 9. rock leftovers of past collisions
Down
  1. 1. developed the first large scale telescope that uses mirrors
  2. 3. the force of ____________ is what causes nuclear fusion to take place
  3. 5. the part of the sun where nuclear fusion is taking place
  4. 6. composed of minerals, gas, and ice
  5. 8. the milky way ________ is where our sun is located