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The four Galilean moons were discovered in the year 1610, but the next moon of Jupiter to be discovered, Amalthea, was not found until 1892. The distinction that was most responsible for the early discovery of the Galilean moons was their: A. orbital speeds. B. orbital periods. C. average orbital radii. D. diameters.

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Erudite1
The correct option is C.
The four Galilean moons that were discovered in 1610 had large average orbital radii, the Galilean moon were the four largest moons of the planet Jupiter. These moons were the first objects that were found to be orbiting around another planet. They were discovered early because of their bigger sizes.

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