Space flight

Space flight

Of or relating to the act of voyaging outside the Earth's atmosphere and into outer space, and the science involved in achieving it.

Industry: Aerospace

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Space flight

quasar

Aerospace; Space flight

Quasi-stellar object observed mainly in radio waves. Quasars are extragalactic objects believed to be the very distant centers of active galaxies.

pyrotechnic switching unit (PSU)

The unit onboard a spacecraft that provides redundant power conditioning and energy storage, and, upon command, redundant power switching for firing electro-explosive or pyro devices. The PSU has the ...

prograde

Aerospace; Space flight

Orbit in which the spacecraft moves in the same direction as the planet rotates. See retrograde.

post meridiem (PM)

Aerospace; Space flight

(Latin: after midday), afternoon.

pluto

Aerospace; Space flight

Ninth planet from the sun, sometimes classified as a small terrestrial planet.

plunge

Aerospace; Space flight

In describing the tracking motion of an AZ-EL or ALT-AZ mounted radio telescope, to "plunge" means to exceed 90° in elevation and then to continue tracking as elevation decreases on the other side ...

phase-lock-loop (PLL)

Aerospace; Space flight

A circuitry in telecommunications technology that generates an output signal whose phase is related to the phase of the input "reference" signal. It is an electronic circuit consisting of a variable ...