Looking for Earth 2

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Across
  1. 3. a huge group of stars and planets
  2. 4. a machine that measures light
  3. 6. a scientist who studies outer space
  4. 7. a large ball of gas that gives off heat and light
Down
  1. 1. the sun and the eight planets
  2. 2. a device that makes things far away look bigger
  3. 5. to travel around or circle something