The Speed Of Planetary Orbits
| Education : Physics Which planet do you think orbits the Sun at a greater speed: Mercury or Pluto? Remember that Mercury is closest to the Sun and Pluto the furthest. You can see that Mercury must be the answer, using Newton's second law, Force = mass x acceleration. The gravitational force on mercury is massive from the Sun, and much, much weaker on Pluto.
 Questions about the planets:
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