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These are the only two planets in our solar system without moons...
A: Mercury & Venus,
B: Venus & Mars,
C: Uranus & Neptune,
D: Neptune & Pluto
What is A: Mercury & Venus. As far as we know, Saturn has the most moons. Saturn has at least 25 satellites that measure at least 6 miles (10 kilometers) in diameter, and several smaller satellites. The largest of Saturn's satellites, Titan, has a diameter of about 3,200 miles (5,150 kilometers) -- larger than the planets Mercury and Pluto.