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surface × 33mars × 6
the-moon × 5
planet × 5
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exoplanet × 3
jupiter × 3
observational-astronomy × 2
the-sun × 2
solar-system × 2
earth × 2
asteroids × 2
life × 2
pluto × 2
water × 2
geology × 2
gas × 2
crater × 2
volcanism × 2
star × 1
telescope × 1
cosmology × 1
light × 1
natural-satellites × 1
