June 22

1633: Galileo Galilei was forced by the Inquisition to "abjure, curse, and detest" his Copernican heliocentric views. 1675: The Royal Greenwich Observatory in England was created by Royal Warrant by Charles II. 1925: Felix Klein, mathematician and creator of the single-surfaced Klein bottle, died. 1941: Germany invaded Stalin's Soviet Union during World War II. 1946: Jet airplanes were used to transport mail for the first time. 1954: Karl Compton, who directed the development of radar during WWII, died. 1973: The first manned Skylab (Skylab 2) crew of astronauts splashed down safely after a then record 28 days in space. 1978: James Christy and Robert Harrington discovered Charon, the only known moon of Pluto. 1983: For the first time a satellite was retrieved from orbit by the Space Shuttle. 1993: Intel introduced the 80586, 64-bit, 60 MHz Pentium processor.