1. 1564 - 1642

3. Periods of Rotation & Revolution around Jupiter: Europa had a 3,5 day revolution around Jupiter, same with its rotation. Lo: Has a 1.7 day revolution, its tidal locked, meaning it has the same rotation time. Ganymede: 7.5 days, tidal locked with Jupiter. Callisto: 16.7 days, same as its rotation. Physical Properties: History: They were named by Simon Marius.

5. It was in 1609, that Galileo observed the moons of Jupiter, now known as the Galilean Moons, which he recorded in his treatise, the Sidereus Nuncius, published in 1610. The observation was very controversial as it proved that Earth was not the only center of movement in the universe. It also lent support to the idea that Earth moved around the Sun, a heretical belief which eventually led to Galileo's imprisonment.

6. Our Quiz ~ 1. What are the names of ALL of Jupiter’s moons? 2. How many moons does Jupiter have? 3. Who discovered Galilean Moons? 4. When did he discover them? 5. When did he die?

7. 1. Lo, Europa, Ganymede, and Callisto 2. 4 3. Galileo 4. 1609 5. 1642