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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. Flow control valve - Wikipedia

    en.wikipedia.org/wiki/Flow_control_valve

    Control valves are normally fitted with actuators and positioners. Pneumatically-actuated globe valves and diaphragm valves are widely used for control purposes in many industries, although quarter-turn types such as (modified) ball and butterfly valves are also used. Control valves can also work with hydraulic actuators (also known as ...

  4. 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 ...

  5. 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 ...

  6. Earthrise - Wikipedia

    en.wikipedia.org/wiki/Earthrise

    Earthrise. Earthrise, taken on December 24, 1968, by Apollo 8 astronaut William Anders. Earthrise is a photograph of Earth and part of the Moon 's surface that was taken from lunar orbit by astronaut William Anders on December 24, 1968, during the Apollo 8 mission. [ 1][ 2][ 3] Nature photographer Galen Rowell described it as "the most ...

  7. 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.

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