Eugene Parker, a physicist who theorised the existence of solar wind and became the first person to witness the launch of a spacecraft bearing his name, has died, his son and the University of Chicago said.His son, Eric Parker, said his father died peacefully at a retirement community in Chicago on Tuesday, about a decade after being diagnosed with Parkinson's disease. He was 94.NASA administrators and university colleagues hailed Parker as a visionary in his field of heliophysics, focused on the study of the sun and other stars.
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