8 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
Great circle
Aerospace; Space flight
An imaginary circle on the surface of a sphere whose centre is at the centre of the sphere.
Gravity waves
Aerospace; Space flight
Certain dynamical features in a planet's atmosphere (not to be confused with gravitational waves, see above).
Gravity assist
Aerospace; Space flight
Technique whereby a spacecraft takes angular momentum from a planet's solar orbit (or a satellite's orbit) to accelerate the spacecraft, or the reverse. See Chapter 4.
Gravitational waves
Aerospace; Space flight
Einsteinian distortions of the space-time medium predicted by general relativity theory (not yet directly detected as of March 2010). (Not to be confused with gravity waves.)
Ground communications facilities (GCF)
Aerospace; Space flight
Facilities that provide data and voice communications between JPL and the three dsccs.
Gamma rays
Aerospace; Space flight
Electromagnetic radiation in the neighbourhood of 100 femtometers wavelength.
Galaxy
Aerospace; Space flight
One of billions of systems, each composed of numerous stars, nebulae, and dust.
