Riccardo Giacconi

Riccardo Giacconi (1931–2018) was an Italian-American astrophysicist who pioneered observational X-ray astronomy and shared the 2002 Nobel Prize in Physics for contributions to the field.

X-ray astronomy: The study of celestial objects and processes through their emitted X-rays. Giacconi helped establish this observational field through rocket experiments and space-based instruments.
X-ray: Electromagnetic radiation with wavelengths shorter than ultraviolet light and longer than gamma rays. X-rays from cosmic sources are the signals Giacconi's instruments were designed to detect.
Herbert Gursky: An American astrophysicist who helped pioneer X-ray astronomy through rocket experiments and satellite surveys. Gursky collaborated with Giacconi on early discoveries, including the detection of Scorpius X-1.
V-2 rocket: A German ballistic missile developed during World War II and later used in scientific research by the United States. Postwar V-2 research flights helped establish rockets as platforms for measurements above the atmosphere.
Scorpius X-1: A bright X-ray binary system in the constellation Scorpius and the first extrasolar X-ray source discovered. Giacconi's 1962 rocket experiment detected this source, confirming that celestial X-ray astronomy was possible.
X-ray telescope: A telescope that collects and focuses X-rays using grazing-incidence mirrors or other specialized optics. Giacconi advanced focusing X-ray optics, which made resolved images of cosmic sources possible.
Bruno Rossi: An Italian-American physicist whose work in cosmic rays and space instrumentation influenced modern astrophysics. Rossi encouraged Giacconi's move into X-ray astronomy and helped secure support for its early experiments.
Aerobee rocket: A US sounding rocket used for upper-atmosphere and astronomical research after World War II. Giacconi's early cosmic X-ray measurements used Aerobee flights to lift detectors above atmospheric absorption.
Uhuru: A NASA satellite launched in 1970 that conducted the first comprehensive survey of the sky in X-rays. Giacconi led the mission, which catalogued hundreds of X-ray sources and transformed the field.
Grazing incidence: Reflection in which radiation strikes a surface at a shallow angle measured from that surface. X-rays reflect from telescope mirrors only at shallow angles, enabling the focusing optics Giacconi helped develop.

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