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Try to imagine what must have gone through Galileo Galilei's mind one January evening in 1610 when he first realized that the four points of light he saw through his new telescope were, in fact, worlds circling Jupiter. The thrill of discovery would have been magnified by the simultaneous realization that an unshakable truth — that all worlds revolved around the Earth — had just collapsed. Although viewing these same moons might not shake up your own worldview, you can at least relive some of Galileo’s excitement by discovering them for yourself with nothing more than binoculars or a small telescope.
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