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Riccardo Giacconi
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<p>Riccardo Giacconi was an Italian-American <a href="/facts/Nobel_Prize/3z1Y3oFL">Nobel Prize</a>-winning <a href="/facts/Astrophysicist/krFPRWLA">astrophysicist</a> who laid down the foundations of <a href="/facts/X-ray_astronomy/KAQ6WxgQ">X-ray astronomy</a>. He was a professor at the <a href="/facts/Johns_Hopkins_University/56US0mHw">Johns Hopkins University</a>. </p>