| http://www.w3.org/ns/prov#value | - Robert P. Kirshner, the Harvard College Professor of Astronomy and Clowes Professor of Science at Harvard University and president of the American Astronomical Society from 2003 to 2005, describes how we use observations of supernovi???exploding stars???to trace cosmic history and to learn more about the nature of the dark energy, one of the deepest mysteries of the physical world.
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