Space

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Across
  1. 1. a system of many types of matter held together by gravity
  2. 6. the use of astronomy and space technology to research outer space
  3. 7. includes everything in outer space
  4. 8. a group of planets, meteors or other objects that orbit a large star
  5. 9. an imaginary boundary where the sky meets the ground or sea
Down
  1. 2. the study of space
  2. 3. a layer of the atmosphere of earth
  3. 4. the outermost part of the sun’s atmosphere
  4. 5. a vehicle used to travel in space