MAARTEN SCHMIDT SIGNED TIME COVER, "M. Schmidt", in black felt tip, March 11, 1966, by Dutch astronomer who discovered the first quasar. In fine condition, with light signature contrast, two horizontal mailing folds and a few light creases.
Maarten Schmidt is a Dutch astronomer known for measuring the distances of quasars. He helped formulate what has come to be known as the Kennicutt-Schmidt law, which is essentially an empirical relation between the gas density and star formation rate in a given region. Later on, he began studying the light spectra of radio sources. Using the famous 200-inch reflector telescope located at the Palomar Observatory, Schmidt identified a visible object known as 3C 273 that corresponded to one of the radio sources he had been studying. Schmidt called 3C 273 a "quasi-stellar" object or a quasar. His identification of the wavelengths of the radiation emitted by quasars led to the theory that they may be among the most distant, and the oldest, objects ever observed, Since his discovery, thousands of quasars have been identified.