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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
opposition
Aerospace; Space flight
Configuration in which one celestial body is opposite another in the sky. A planet is in opposition when it is 180 degrees away from the sun as viewed from another planet (such as Earth). For ...
oort cloud
Aerospace; Space flight
A large number of comets theorized to orbit the sun in the neighborhood of 50,000 AU.
one-way
Aerospace; Space flight
Communications mode consisting only of downlink received from a spacecraft.
non-return to zero (NRZ)
Aerospace; Space flight
Modulation scheme in which a phase deviation is held for a period of time in order to represent a data symbol. See Chapter 10.
nutation
Aerospace; Space flight
A small nodding motion in a rotating body. Earth's nutation has a period of 18.6 years and an amplitude of 9.2 arc seconds.
non-coherent
Aerospace; Space flight
Communications mode wherein a spacecraft generates its downlink frequency independent of any uplink frequency.
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