Assertion: nebula's planet | /r/HasProperty | moon
Facets:
Source sentences:
text: Most of the collapsing mass collected in the center, forming the Sun, while the rest flattened into a protoplanetary disk out of which the planets, moons, asteroids, and other small Solar System bodies formed.
text: The rock and dust went off to make the terrestrial planets, their moons, asteroids and all other objects in the Solar System.