Landee's crossword puzzle

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Across
  1. 3. (Neptune, Saturn, mars, earth, Jupiter)these things are________.
  2. 6. a small bright dot that you see in the star at night
  3. 11. often referred as the ISS
  4. 14. a cloud of gas and dust visible in outer space
  5. 15. a powerful telescope launched by NASA
  6. 16. an artificial body placed in orbit around a planet
  7. 17. how heavy something is
  8. 18. a region of space that has a very intense gravitational field
  9. 19. a system of millions and billions of stars
  10. 21. the planet that we live on
  11. 22. a star also known as the North star
  12. 23. the chemical element of atomic number 1
Down
  1. 1. a constellation, galaxy, and TV series
  2. 2. a triple star system
  3. 4. 1.5 hours is _________ minutes
  4. 5. _______ brings us down
  5. 7. the moon _______ around the earth in a curved path
  6. 8. a picture formed in the night sky by stars
  7. 9. a space probe launched by NASA
  8. 10. a region of the solar system beyond the orbit of neptune
  9. 12. a property of matter that continues in its existing state of rest
  10. 13. a faint luminous band of light stretching across the night sky
  11. 20. the distance that light travels in one year