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Science and Technology
Astronomy and Space Exploration
Astronomy: General
Astronomy: General
quadrature
quasar
quintessence
radar astronomy
radian
radiant
radio astronomy
Radio waves
radiogenic
Ranger
Rayleigh scattering
Reading and writing for the blind
Receiver
red giant
red shift
reflector
Refractive index
refractory
Regolith
relaxation time
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Earth and Environment
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Additional References
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