washingtonpost.com – An artist’s rendering of NASA’s Juno spacecraft at Jupiter. (European Pressphoto Agency/NASA/JPL-Caltech)
On a clear, crisp winter night in January 1610, Galileo Galilei walked out onto his balcony and tilted his telescope toward Jupiter. He focused the lens on the big, bright planet and several stars nearby, marked the position of all four bodies in his notes, then continued his sweep of the night skies.
The following evening, when he returned his gaze to the same spot, he found something peculiar: The stars had moved. They appeared to be following Jupiter — almost as though they were moons in orbit around it.
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