Question

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 early discovery of the Galilean and moons was their
A.) orbital periods

B.) diameters

C.) average orbital radii.

D.) orbital speeds

Answer 1

I could be very wrong here but, I believe the answer to be "C" average orbital radii.