Planned closure, one day only - NCAR Mesa Lab - Saturday April 18 more info>
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Cosmic ray astrophysics began in 1912 when Victor Hess established that an extraterrestrial (and nonsolar) source of ionization inundates the Earth. More than a century later, a combination of remote sensing and in situ observations have built up a picture of cosmic rays as an important sink of supernova energy and a major constituent of the interstellar medium. I will review our current state of knowledge of cosmic rays, describe some heliospheric and laboratory analogs, and discuss some ongoing research.