Answer:
1) It gets slower the farther out they are.
2) The farther out you are from the sun the less gravitational pull you have, which makes it go slower as it orbits.
3) Gravity ;) :)
Explanation:
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1.) The four inner planets have slower orbits and the four outer planets have faster orbits.
2.) The closer a planet is to the Sun, the stronger the Sun's gravitational pull on it, and the faster the planet moves.
3.) Gravity
