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oort-cloud × 28solar-system × 10
comets × 5
planet × 4
gravity × 3
kuiper-belt × 3
orbit × 2
observational-astronomy × 2
exoplanet × 2
interstellar-medium × 2
star × 1
the-sun × 1
black-hole × 1
telescope × 1
astrophysics × 1
universe × 1
asteroids × 1
atmosphere × 1
dark-matter × 1
orbital-elements × 1
gas-giants × 1
planetary-formation × 1
star-systems × 1
apparent-magnitude × 1
formation × 1
