Crossword

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Across
  1. 3. SI Unit of Light
  2. 6. A kind of lens used to magnify objects.
  3. 7. This is why the sky is blue
Down
  1. 1. First person to see the Rings of Saturn and the Moons of Jupiter with his telescope.
  2. 2. Joseph Fraunhofer invented and used it to discover absorption lines of the stars.
  3. 4. He discovered that prism can be used to split white light into it's components.
  4. 5. We see phases of this because of reflection from our nearest star.