Why the sun is in the center/Why planets are spheres

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Across
  1. 2. Where is the sun in this solar system
  2. 6. Held together because of the sun's gravity
  3. 7. The movement around the sun
  4. 8. The weight the sun holds
  5. 9. Small balls of plasma which are spheres
Down
  1. 1. The reason why planets are spheres
  2. 3. What we believe our planets formed on
  3. 4. Spherical balls of rock and ice
  4. 5. Are not spheres because they are cold and small