Gravity & Galaxies

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Across
  1. 3. path of an object as it revolves around another object in space
  2. 5. huge group of stars, star systems, dust & gas held together by gravity
  3. 6. a ball of hot gas that undergoes nuclear fisson
  4. 7. object that orbits a star, is large enough to become rounded by its own gravity,& has cleared the area of its orbit
  5. 8. active, young galaxies with black holes at their center
  6. 9. the shape of planets' orbit
Down
  1. 1. a natural satellite that orbits a planet
  2. 2. an object that orbits a planet
  3. 4. the system consisting of the sun, planets, & other objects that revolve around it
  4. 7. used to measure the distance of nearby stars