Before the eclipse this summer, NASA warned us over and over again not to stare directly at the sun — but now they’re doing just that. Its researchers have reinvented a photography technique more than a century old, using the sun itself as a backdrop in order to capture the shockwave...
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https://skpsoft.com/news/nasa-engineers-stare-at-the-sun-to-see-shockwaves-from-supersonic-flight/
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