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artificial-satellite × 820orbital-mechanics × 143
orbit × 94
low-earth-orbit × 59
communication-satellite × 45
launch × 41
attitude × 34
geostationary × 32
debris × 31
cubesat × 28
communication × 27
solar-power × 26
spacecraft × 24
two-line-elements × 23
the-moon × 22
orbital-elements × 22
history × 21
observation × 21
tracking × 20
earth-observation × 20
spacex × 19
gps × 19
rockets × 18
propulsion × 18
orbital-maneuver × 18