Axels space crossword

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Across
  1. 3. what is the biggest PLANET in our solar system
  2. 5. what planet is closest to the sun?
  3. 7. What is the name of our nearest neighbor galaxy?
  4. 8. what was the name of the spacecraft that Laika travelled to space in?
  5. 9. what planet was made into a dwarf planet?
Down
  1. 1. what is the name of the center of a black hole?
  2. 2. Which force keeps the planets in their orbits?
  3. 4. what is the coldest planet in the solarsystem
  4. 6. what is the name of the edge of a black hole
  5. 8. what planet did the Cassini-Huygens orbit around for 13 years?