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  2. Apollo 15 postal covers incident - Wikipedia

    en.wikipedia.org/wiki/Apollo_15_postal_covers...

    The Apollo 15 postal covers incident, a 1972 NASA scandal, involved the astronauts of Apollo 15, who carried about 400 unauthorized postal covers into space and to the Moon's surface on the Lunar Module Falcon. Some of the envelopes were sold at high prices by West German stamp dealer Hermann Sieger, and are known as "Sieger covers".

  3. Apollo Guidance Computer - Wikipedia

    en.wikipedia.org/wiki/Apollo_Guidance_Computer

    The Apollo Guidance Computer ( AGC) was a digital computer produced for the Apollo program that was installed on board each Apollo command module (CM) and Apollo Lunar Module (LM). The AGC provided computation and electronic interfaces for guidance, navigation, and control of the spacecraft. [ 3] The AGC was the first computer based on silicon ...

  4. Check valve - Wikipedia

    en.wikipedia.org/wiki/Check_valve

    A ball check valve is a check valve in which the closing member, the movable part to block the flow, is a ball. In some ball check valves, the ball is spring -loaded to help keep it shut. For those designs without a spring, reverse flow is required to move the ball toward the seat and create a seal.

  5. Apollo 13 - Wikipedia

    en.wikipedia.org/wiki/Apollo_13

    Apollo 13 (April 11–17, 1970) was the seventh crewed mission in the Apollo space program and the third meant to land on the Moon. The craft was launched from Kennedy Space Center on April 11, 1970, but the lunar landing was aborted after an oxygen tank in the service module (SM) ruptured two days into the mission, disabling its electrical and life-support system.

  6. Apollo Lunar Surface Experiments Package - Wikipedia

    en.wikipedia.org/wiki/Apollo_Lunar_Surface...

    The Apollo Lunar Surface Experiments Package ( ALSEP) comprised a set of scientific instruments placed by the astronauts at the landing site of each of the five Apollo missions to land on the Moon following Apollo 11 (Apollos 12, 14, 15, 16, and 17 ). Apollo 11 left a smaller package called the Early Apollo Scientific Experiments Package, or ...

  7. U.S. space exploration history on U.S. stamps - Wikipedia

    en.wikipedia.org/wiki/U.S._space_exploration...

    Earthrise, taken by Apollo 8 astronaut William Anders on 24 December 1968 Earthrise used on the Apollo 8 1969 Issue. Up until the time of the Apollo 8 mission, all crewed ventures into space were confined to brief flights into space or to orbiting the Earth. Apollo 8 was the first human spaceflight mission to leave Earth orbit; the first to be ...

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