Assertion: nebula's material | /r/HasProperty | attracted to one another
Facets:
value: over time
type: TEMPORAL
Source sentences:
text: The nature of gravity means that over time these materials will be attracted to one another, forming into clumps of matter which in turn will join other clumps of matter eventually forming into huge dark nebula clouds that can be seen against the bright backdrop of the bright Milky Way (picture above).