Assertion: dark matter | /r/HasProperty | known particle
Facets:
value: in the universe
type: LOCATION
Source sentences:
text: There are two categories of explanations that might be possible: 1) that dark matter is indeed matter and may be known particles in the universe, or 2) that dark matter is not matter and the observations of galaxies can be explained by parameters in the universe that are variable, and not constant.