Assertion: geologist | /r/CapableOf | struggle to extend the astronomical time scale
Facets:
value: because of solar system chaos
type: CAUSE
value: farther back
type: OTHER
Source sentences:
text: However, geologists and astronomers have struggled to extend the astronomical time scale farther back than 50 million years because of solar system chaos, which has made the time scale unpredictable beyond a certain point.