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He is the astronomer who first observed callisto.
a.Galileo Galilei
b.Johannes Kepler
c.Ptolemy
d.Ttycho Brahe​


Sagot :

Answer:

A. Galileo Galilei

Explanation:

Hope it helps

A. Galileo Galilei

Galileo Galilei discovered Callisto and Jupiter's other three large moons: Ganymede, Io and Europa.

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