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tides × 91moons × 43
planets × 35
science-based × 25
orbital-mechanics × 14
gravity × 11
physics × 8
earth-like × 8
ocean × 8
astronomy × 7
tidal-forces × 6
internal-consistency × 6
geography × 5
gas-giants × 5
geology × 4
weather × 4
solar-system × 4
hard-science × 3
water × 3
eclipses × 3
magic × 2
space × 2
environment × 2
climate × 2
fauna × 2