Top: Science: Astronomy: Terminology: X

[ history ]

X-1

A rocket-powered research airplane, the first to fly faster than sound, on 14 October 1947.


[ history ]

X-rays

electromagnetic waves of short wavelength, capable of penetrating some thickness of matter. Medical x-rays are produced by letting a stream of fast electrons come to a sudden stop at a metal plate; it is believed that X-rays emitted by the Sun or stars also come from fast electrons. 



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