Our place in space W1

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Across
  1. 2. Type of galaxy; squashed circle
  2. 5. The force which brings two masses together
  3. 8. A gaseous or rocky satellite of a star
  4. 10. The outermost part of a galaxy
  5. 12. A group of galaxies which are pulled together by gravity
  6. 13. The part of the galaxy with the most gravity
  7. 14. A natural satellite that orbits a planet.
  8. 16. A massive system containing billions of stars, planets, black holes, gas, and dust held together by gravity.
  9. 17. An indigenous constellation used for harvesting eggs at a particular time of year
  10. 18. The closest galaxy to the milky way
Down
  1. 1. The centre of a black hole
  2. 3. The stretching of matter into thin strips inside a black hole
  3. 4. The point of no return for a black hole
  4. 6. A collection of dust and gas which is contracting
  5. 7. An object with so much gravity not even light escapes
  6. 9. Spinning disc of gas and dust swirling around a black hole's event horizon
  7. 11. The distance which light travels in space over one year
  8. 14. The galaxy that contains the solar system
  9. 15. Type of galaxy - looks like snail shell