This type of radiation is reflected at shallow angles via grazing incidence optics in Wolter telescopes. The first comprehensive survey of the sky for this type of radiation was performed by a satellite proposed by Riccardo Giacconi, Uhuru. (0[1])Binaries featuring a donor star and an acceptor neutron (20[1])star (20[2]0[1])or black hole predominantly emit this (0[1])type (20[1]0[1])of (0[1])radiation. (20[2]0[6])Depending on its energy, this type of radiation can be “hard” or “soft.” This type of radiation is studied by NASA’s (*) Chandra (10[2])Observatory. (10[3]0[1])The black hole in Cygnus (10[1]0[1])is named for this type of radiation, which it emits at wavelengths of several (0[1])angstroms. (0[1])For 10 points, Wilhelm Röntgen discovered (10[1])what (10[1])type (10[1])of electromagnetic (10[2]0[1])radiation (0[1])with slightly higher frequency than ultraviolet (10[1])radiation? (10[3]0[2])■END■ (10[8]0[3])