X-rays have a shorter wavelength than ultraviolet but a longer wavelength then gamma rays.

in 1895 by German scientist Wilhelm Conrad Roentgen discovered x-rays when He started firing streams of x-rays through arms and hands created detailed images of the bones inside.

X-RAYS

HUMAN USES

X-Ray telescope (XRT)is a telescope that observes remote objects in the X-ray spectrum

ASTRONOMIC USES