Here’s a piece of high-energy astrophysics trivia (you never know when you might need to know these things). Where does the “X” in “X-ray” come from?

The answer is that a German physicist, Wilhelm Roentgen, discovered a new form of radiation in 1895. He called it X-radiation because he didn’t know what it was. Yes, it’s as simple as that. This mysterious radiation had the ability to pass through many materials that absorb visible light. X-rays also have the ability to knock electrons loose from atoms. Over the years these exceptional properties have made X-rays useful in many fields, such as medicine and research into the nature of the atom. And then, of course, there’s the Chandra X-ray Observatory.


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