What was the biggest step in 50 years of human space travel?
April 12, 1961: Yuri Gagarin becomes the first person to orbit the Earth.
July 20, 1969: Neil Armstrong and Buzz Aldrin land on the moon and return to Earth.
July 1975: American and Soviet spaceships dock in space, the first international rendezvous.
April 12, 1981: The first manned space shuttle, Columbia, is launched.
Feb. 20, 1986: The core unit of the Soviet space station Mir is launched.
February 1994: A Russian cosmonaut flies for the first time aboard a U.S. shuttle.
December 1999: Discovery is launched on a third maintenance mission for the crippled Hubble space telescope.
July 14, 2004: Mike Melvill pilots the first privately built spacecraft, called SpaceShipOne, past the Karman Line and into space.
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