During the following year, three different crews of three astronauts each visited Skylab for missions of between 28 and 84 days. established its first orbiting space station in May 1973 with the launch of Skylab. Although it has performed all those tasks, the shuttle program has also experienced two major disasters, with the loss of the shuttle Challenger in January 1986 and the shuttle Columbia in February 2003. The reusable shuttles were intended for tasks such as launching and servicing satellites, performing near-zero-gravity scientific experiments, and transporting crew members and major components to the International Space Station. spacecraft, the space shuttles were intended to be brought back to Earth and reused many times. Space Achievement issue, 1981, Scott 1917, Gravure postage stamps have honored these missions one stamp also depicts Pluto, the farthest planet and the only one not yet explored by an unmanned craft. Just as manned space missions have explored Earth orbit and the Moon, numerous unmanned explorers have explored the solar system, including seven of the other eight planets and a large number of moons, including our own. The rocket-powered Bell X-1, included in the Air Stamps section above, was the first plane to break the sound barrier. postage stamps related to rocket science, including two honoring early scientists in this field, Robert H. and the Soviet Union after the war, eventually making space travel possible. Rocket science dates back to the German rockets of World War II, but was pursued vigorously by both the U.S. The basic science behind modern space travel is rocket science-the use of incredibly powerful propellants in large quantities to launch manned spacecraft or unmanned satellites or planetary explorers into Earth orbit or beyond. Goddard, rocket pioneer, 1964, Scott C69, Engraving
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