Assertion: solar system | /r/HasProperty | countless asteroid s
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Source sentences:
text: Solar system , assemblage consisting of the Sun —an average star in the Milky Way Galaxy —and those bodies orbiting around it: 8 (formerly 9) planets with about 170 known planetary satellites (moons); countless asteroid s, some with their own satellites; comet s and other icy bodies; and vast reaches of highly tenuous gas and dust known as the interplanetary medium .