Sixty years ago, Eugene Parker, then a young researcher at the University of Chicago, wrote a landmark paper in which he predicted the existence of the solar wind, a ubiquitous stream of charged particles flowing from the Sun. His theory was confirmed by measurements from the Soviet Union’s Luna 1 probe in 1959 and by NASA’s Venus-bound Mariner 2 spacecraft in 1962, but many questions about the Sun persist. Most vexing is how the temperature of the solar outer atmosphere, or ...

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