Space Crossword

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Across
  1. 2. caused by the moon's gravitational pull on the oceans
  2. 5. planets in other planetary systems
  3. 7. a natural satellite,
  4. 8. a telescope and the last name of an astronomer
  5. 9. one of the brightest things in space
Down
  1. 1. a measurement of distance in reference to light
  2. 3. caused by the earth's tilt
  3. 4. earth's evil twin
  4. 6. a cloud of gas and dust in space