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life × 118mars × 15
planet × 14
astrobiology × 13
earth × 12
solar-system × 11
exoplanet × 11
origin-of-life × 11
galaxy × 10
extra-terrestrial × 9
earth-like-planet × 7
star × 5
the-sun × 5
habitable-zone × 5
universe × 4
natural-satellites × 4
space-time × 4
red-dwarf × 4
drake-equation × 4
observational-astronomy × 3
the-moon × 3
milky-way × 3
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planetary-atmosphere × 3
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