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  2. Apollo 11 - Wikipedia

    en.wikipedia.org/wiki/Apollo_11

    Apollo 11 (July 16–24, 1969) was the American spaceflight that first landed humans on the Moon. Commander Neil Armstrong and Lunar Module Pilot Buzz Aldrin landed the Apollo Lunar Module Eagle on July 20, 1969, at 20:17 UTC, and Armstrong became the first person to step onto the Moon's surface six hours and 39 minutes later, on July 21 at 02: ...

  3. Fifth-wheel coupling - Wikipedia

    en.wikipedia.org/wiki/Fifth-wheel_coupling

    The fifth-wheel coupling provides the link between a semi-trailer and the towing truck, tractor unit, leading trailer or dolly. The coupling consists of a kingpin, a 2-or- -inch-diameter (50.8 or 88.9 mm) vertical steel pin protruding from the bottom of the front of the semi-trailer, and a horseshoe-shaped coupling device called a fifth wheel ...

  4. Apollo Lunar Module - Wikipedia

    en.wikipedia.org/wiki/Apollo_Lunar_Module

    Apollo Lunar Module. The Apollo Lunar Module ( LM / ˈlɛm / ), originally designated the Lunar Excursion Module ( LEM ), was the lunar lander spacecraft that was flown between lunar orbit and the Moon's surface during the United States' Apollo program. It was the first crewed spacecraft to operate exclusively in the airless vacuum of space ...

  5. Timeline of space exploration - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_space_exploration

    This is a timeline of space exploration which includes notable achievements, first accomplishments and milestones in humanity's exploration of outer space . This timeline generally does not distinguish achievements by a specific country or private company, as it considers humanity as a whole. See otherwise the timeline of private spaceflight or ...

  6. Escalator - Wikipedia

    en.wikipedia.org/wiki/Escalator

    Escalator. For the album by Sam Gopal, see Escalator (album). An escalator is a moving staircase which carries people between floors of a building or structure. It consists of a motor -driven chain of individually linked steps on a track which cycle on a pair of tracks which keep the step tread horizontal.

  7. Airstair - Wikipedia

    en.wikipedia.org/wiki/Airstair

    An airstair is a set of steps built into an aircraft so that passengers may board and alight the aircraft. The stairs are often built into a clamshell-style door on the aircraft. Airstairs eliminate the need for passengers to use a mobile stairway or jetway to board or exit the aircraft, providing more independence from ground services.

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