Assertion: asteroid belt's object | /r/HasProperty | the source
Facets:
value: for all long-period comets
type: OTHER
Source sentences:
text: The Oort cloud is a hypothetical spherical cloud of up to a trillion icy objects that is thought to be the source for all long-period comets and to surround the Solar System at roughly 50,000 AU (around 1 light-year (ly)), and possibly to as far as 100,000 AU (1.87 ly).