Io, Europa, Ganymede, and Callisto are called the "Galilean" satellites because:
A. They are named after Galileo's daughters.
B. The "Galileo" spacecraft discovered them.
C. Galileo was the first to identify them as moons of Jupiter.
D. They were discovered the year Galileo died.
E. "Jupiter" was originally called "Galileo" in Greek.
Ans: C. Galileo was the first to identify them as moons of Jupiter.
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