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mars × 127atmosphere × 17
planet × 13
earth × 11
life × 11
water × 11
solar-system × 8
venus × 8
the-sun × 7
telescope × 7
the-moon × 5
magnetic-field × 5
orbit × 4
astrophysics × 4
amateur-observing × 4
temperature × 4
weather × 4
distances × 3
jupiter × 3
time × 3
night-sky × 3
kepler × 3
newtonian-telescope × 3
naked-eye × 3
naming × 3
