Galileo Galilei

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The mysteries of Europa

THE MYSTERIES OF EUROPA

On January 7, 1610, the Italian astronomer Galileo Galilei peered at Jupiter through a primitive telescope he had fashioned.  He described what he saw as “three fixed stars, totally invisible by their smallness,“ but over the next few nights, he noticed one more point of light, and that they changed positions.  Moreover, they moved in a direction that was opposite that of the other stars.  He eventually concluded that these were not truly “stars” but were actually four moons of Jupiter and they were subsequently called Io, Ganymede, Callisto and...

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