star × 203
orbit × 149
moon × 143
sun × 135
solar-system × 131
gravity × 127
galaxy × 122
planets × 111
black-hole × 107
earth × 107
universe × 100
telescope × 99
observation × 84
exoplanet × 77
cosmology × 72
light × 71
amateur-observing × 64
distances × 64
milky-way × 53
general-relativity × 49
big-bang-theory × 46
space-time × 45
astrophysics × 44
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