Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Johannes Kepler used simple mathematics to describe how planets move. Kepler was an assistant to the most accurate astronomical observer of the time, Tycho Brahe . Kepler lived from 1571 to 1630, during the time of discovery of the telescope. Kepler was one of the few vocal supporters of Galileo 's discoveries and the Copernican system of planets orbiting the Sun instead of the Earth .
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