Assertion: period comet | /r/CapableOf | plunge towards the sun
Facets:
value: from the oort cloud
type: LOCATION
value: because of gravitational perturbations
type: CAUSE
Source sentences:
text: Long-period comets plunge towards the Sun from the Oort cloud because of gravitational perturbations caused by either the massive outer planets of the Solar System (Jupiter, Saturn, Uranus, and Neptune), or passing stars.