Assertion: nebula | /r/CapableOf | pull by its own gravitational force
Facets:
value: gradually
type: MANNER
value: together
type: MANNER
Source sentences:
text: In 1755 the German philosopher Immanuel Kant suggested that a nebula in slow rotation, gradually pulled together by its own gravitational force and flattened into a spinning disk, gave birth to the Sun and planets.