Where are we in the universe?

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Across
  1. 4. / the central part of an object
  2. 6. / a straight line across a circle, through the center
  3. 8. / how far it is from one place to another place
  4. 10. / objets, such as those in space or on Earth.Moons and planets are bi\odies in space
  5. 12. / the outside part of something, the top of the water
  6. 14. / the force that pulls everything towards the Earth
  7. 15. / on the outside: far fro the center
Down
  1. 1. / the path of a planet or an object that is moving around another thing in space
  2. 2. / a person who studies or knows a lot about the sun, moon, planets, and stars
  3. 3. / large holes in the ground, caused by something large hitting them
  4. 5. / to travel around a new place to learn about it
  5. 7. / all physical substance, or a substance of a particular kind
  6. 9. / inside; towrds or close to nthe center
  7. 11. probe / a spacecraft without people that collects information and sends it back to Earth
  8. 13. / special or not like anyone or anything else