Assertion: dark matter's gravity | /r/CapableOf | hold the cluster
Facets:
value: together
type: MANNER
Source sentences:
text: The visible matter couldn’t have produced enough gravity to hold the cluster together, and some of the fastest-moving galaxies should have been “flung clear of the cluster, like water droplets thrown off a spinning bicycle tire,” as theoretical physicist Brian Greene put it in his 2004 book "The Fabric of the Cosmos.