f those who came before them, and some of the best work can come from collaboration. Nonetheless, there is also intense competition and the desire to build up one's own reputation, even if that occurs at the expense of another.
Kepler himself has not been above this controversy. His own work drew on that of Tycho Brahe, but Kepler did not gain full access to Tycho's data until after the latter's death. Isaac Newton drew heavily on Kepler's own work, yet failed to acknowledge that fact when he published his Principia Mathematica. During Tycho's life, he and Kepler disagreed on the most fundamental issue-Tycho maintained a geocentric view of the solar system while Kepler favored the heliocentric perspective. There were other differences, as well. Tycho's view was that as a mathematician, his role was to identify the mathematics that described the heavens; Kepler was compelled to explore why the stars and planets move as they do in addition to presenting the ma
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