Assertion: comet | /r/HasProperty | noticed by human
Facets:
value: for millennia
type: TEMPORAL
Source sentences:
text: From ancient sources, such as Chinese oracle bones, it is known that comets have been noticed by humans for millennia.
text: From ancient sources, such as Chinese oracle bones, it is known that comets have been noticed by humans for millennia.
text: From ancient sources, such as Chinese oracle bones, it is known that comets have been noticed by humans for millennia.