"Evidence for X Rays from Sources Outside the Solar System", in Physical Review Letters, December 1, 1962. ++Nobel Prize in Physics - 2002++

GIACCONI, Riccardo; Herbert Gursky, Frank R. Paolini, and Bruno B. Rossi. "Evidence for X Rays from Sources Outside the Solar System", in "Physical Review Letters", volume 9, p 439, December 1, 1962. Very fine copy in the original wrappers, with owner's name in pen at top right front wrapper. "Riccardo Giacconi shared the 2002 Nobel Prize with Raymond Davis and Masatoshi Koshiba; Davis and Koshiba for the development of neutrino astronomy, and Giacconi for the discovery of cosmic x-ray sources. This Letter reports the first observation of an x-ray source outside the Solar System. The x-ray detector was launched on a rocket to look for x-ray emissions from the Moon; instead they found a bright source of soft x-rays in the constellation Scorpius. This source, now known as Scorpius X-1, is the brightest x-ray source in the sky after the Sun. It has since been identified as a neutron star in a binary-star system some 9,000 light years away."--American Physical Society website for PRL Milestone papers.…