Riccardo Giacconi

Riccardo Giacconi was an astrophysicist whose work helped establish X-ray astronomy. Born in Genoa in 1931 and educated in Milan, he moved to the United States in 1956 with a Fulbright scholarship. ESO's biography and CV document his Italian background and research career.

At American Science and Engineering, Giacconi pursued a program of space-based X-ray observations. A 1962 paper by Giacconi, Herbert Gursky, Frank R. Paolini and Bruno B. Rossi reported evidence for X-ray sources outside the solar system. His colleagues' National Academy of Sciences memoir describes the detection of Scorpius X-1 and an X-ray background.

Giacconi's group later developed the Uhuru satellite and the Einstein X-ray Observatory. His career also included leadership at the Space Telescope Science Institute and ESO. In 2002 he received a share of the Nobel Prize in Physics for contributions leading to discovery of cosmic X-ray sources.

Begin with the original paper's authors and observations, then compare the later memoir's explanation. This reveals the instruments and teams behind a celebrated discovery, rather than treating a telescope or observatory as one person's achievement.