Assertion: convict's sentence | /r/HasProperty | permanent
Facets:
value: in heinlein's book
type: LOCATION
value: necessarily
type: DEGREE
Source sentences:
text: In Heinlein's book, a sentence of lunar transportation is necessarily permanent, as the long-term physiological effects of the moon's weak surface gravity (about one-sixth that of Earth) leave "loonies" unable to return safely to Earth.