The space

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Across
  1. 3. work with NASA
  2. 5. is used for space travel
  3. 7. the planet sixth in order of distance from the Sun
Down
  1. 1. is seen in the sky
  2. 2. has different forms and can be seen only at night
  3. 3. is seen on rare occasions from the earth as a bright line in the sky
  4. 4. moves around the earth and can be seen at night:
  5. 6. is the planet in where we live
  6. 7. is a star not a planet