Assertion: terrestrial planet's density | /r/CapableOf | become great
Facets:
value: within 50 million years
type: TEMPORAL
Source sentences:
text: Within 50 million years, the pressure and density of hydrogen in the centre of the protostar became great enough for it to begin thermonuclear fusion.
text: Within 50 million years, the pressure and density of hydrogen in the center of the protostar became great enough for it to begin thermonuclear fusion.