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comet × 66rosetta × 21
asteroid × 11
philae × 10
orbital-mechanics × 8
mining × 5
orbit × 4
landing × 4
planetary-science × 4
probe × 4
deep-space × 3
water × 3
lander × 3
mars × 2
history × 2
communication × 2
gravity × 2
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colonization × 2
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terraforming × 2
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