Assertion: polonium | /r/HasProperty | studied for possible use
Facets:
value: in heating spacecraft
type: LOCATION
Source sentences:
text: Polonium had been studied for possible use in heating spacecraft.
text: Polonium had been studied for possible use in heating spacecraft
text: Polonium has been studied for possible use in heating spacecraft.
text: Polonium has been studied for possible use in heating spacecraft.
text: Polonium has been studied for possible use in heating spacecraft.
text: Polonium has been studied for possible use in heating spacecraft.
text: Polonium has been studied for possible use in heating spacecraft.
text: Polonium has been studied for possible use in heating spacecraft.