star × 138
moon × 111
orbit × 101
sun × 98
gravity × 95
solar-system × 89
galaxy × 85
earth × 84
planets × 78
black-hole × 78
universe × 76
telescope × 58
observation × 58
light × 54
cosmology × 53
exoplanet × 50
amateur-observing × 48
distances × 42
general-relativity × 38
space-time × 37
big-bang-theory × 35
milky-way × 34
space × 31
mars × 30
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