Corey S PowellArthur Walker, Jr, had a big, often-overlooked influence in space science. He pioneered using x-rays to study activity on the Sun, led the Challenger investigation, and opened opportunities for underrepresented groups in astronomy. https://skyandtelescope.org/astronomy-resources/famous-astronomers/arthur-b-c-walker-ii-x-ray-astrophysicist/ #Juneteenth #BlackInStem
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