Recreating a 400 year old book

On the night of January 7, 1610, Galileo Galilei, a resident of Padua, walked onto his balcony and tipped his telescope toward space. He spotted three stars near Jupiter and graphed their positions in a notebook. Six days later, he looked through his telescope again and found the same stars—but their positions had shifted. They were, he realized, moons orbiting Jupiter. Galileo had long believed … Continue reading Recreating a 400 year old book