1983 Event Japan launches Tenma satellite to study x-rays (450/570 km) 1975 Event Small Astronomy Satellite Explorer 53 launched to study X-rays 1970 Event Small Astronomy Satellite Explorer 42 launched to study X-rays 1896 Event German physicist Wilhelm Roentgen's discovers x-rays 1896 Event Wilhelm Rontgen announces his discovery of x-rays 1895 Event Wilhelm Roentgen (Germany) discovers X-rays 1892 Birthday Arthur H Compton, U.S. physicist, X-rays 1845 Birthday Wilhelm Konrad Rontgen, born in Germany, discovered X-rays, Nobel 1901
