Assertion: galax's star | /r/HasProperty | held by gravitational forces
Facets:
value: together
type: MANNER
Source sentences:
text: In 1750 the English astronomer Thomas Wright, in his An Original Theory or New Hypothesis of the Universe, speculated (correctly) that the galaxy might be a rotating body of a huge number of stars held together by gravitational forces, akin to the Solar System but on a much larger scale.