Wilhelm Conrad Roentgen, a German physicist, whilst experimenting with electron beams in a gas discharge tube, discovers a new form of radiation which has the ability to pass through many materials that adsorb visible light. He names it "X-radiation" to denote its unknown nature.




Further info :

How X-Rays work
http://www.howstuffworks.com/x-ray.htm

X-Ray Astronomy
http://chandra.harvard.edu/xray_astro/index.html

X-Ray WWW Server - provides links to additional locations
for information about x-ray research
http://xray.uu.se/