Space exploration began with the launch of Sputnik and Astrophysics was born as the application of physics to the phenomena observed by Astronomy, which etymologically means laws of the stars.
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| Galilean Satellites |
The four largest moons of Jupiter, Io, Europa, Callisto and Ganymede, which were discovered telescopically by Galileo in 1610. They are easily observed with the aid of a small telescope or binoculars and their orbital motion around Jupiter can be readily followed.
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