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observation × 80artificial-satellite × 20
iss × 8
rockets × 6
telescope × 6
the-moon × 5
spacecraft × 5
imaging × 5
space-telescope × 5
the-sun × 4
hubble × 4
launch × 3
orbit × 3
planetary-science × 3
photography × 3
tesla-roadster × 3
earth-observation × 3
astronomy × 3
solar-dynamic-observatory × 3
orbital-mechanics × 2
spacex × 2
nasa × 2
apollo-program × 2
crewed-spaceflight × 2
landing × 2
