Assertion: dark matter's form | /r/HasProperty | dark energy
Facets:
value: prior to these observations
type: TEMPORAL
Source sentences:
text: The other form of dark energy proposed is the dark energy spread out in the space as a scalar field.
text: Prior to these observations, the only forms of matter-energy known to exist were ordinary matter, dark matter, and radiation.
text: To account for these differences, it appears that the universe contains a mysterious form of matter that we can’t observe, called dark matter.