the things of space

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Across
  1. 1. A measurement that can effect the force of gravity
  2. 5. A probe sent into space by NASA in 1977 that we call the most distant human-made object
  3. 7. The third planet in our solar system from the sun
  4. 8. An object/occurrence that happens/forms in space when gravity is super intense
  5. 9. A sphere that orbits the sun
  6. 10. something that we see in the night sky that emits light and is made of hot gasses
  7. 13. The time it takes LEO to complete one orbit
  8. 15. A force that keeps us in orbit with the sun
  9. 16. The Galaxy that our solar system is in
  10. 17. The birth place for stars
Down
  1. 2. A tool/object that we send into space to transmit signals to electronics
  2. 3. Something that the stars can form in the night sky
  3. 4. What we call the north star
  4. 6. A triple star system about four light years away from earth
  5. 11. A measurement of time we use to calculate the distance from Earth to the sun
  6. 12. What the planets do when they circle the sun
  7. 14. One of three main elements that makes a star
  8. 15. What the milky way is