6 Terms
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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
doppler effect
Aerospace; Space flight
The effect on frequency imposed by relative motion between transmitter and receiver. See Chapter 6.
descending node
Aerospace; Space flight
The point at which an orbit crosses a reference plane (such as a planet's equatorial plane or the ecliptic plane) going south.
density
Aerospace; Space flight
Mass per unit volume. For example, the density of water can be stated as 1 gram/cm3.
declination
Aerospace; Space flight
The measure of a celestial body's apparent height above or below the celestial equator.
decibel
Aerospace; Space flight
Db, an expression of ratio (see db, above). One tenth of a Bel. See NIST website for further definition.
comets
Aerospace; Space flight
Small bodies composed of ice and rock in various orbits about the sun.
