As a geologically inactive <e1>remnant</e1> from accretionary <e2>epochs</e2> of solar system history, Callisto was expected to be a dead, cratered relict, useful only as a contrast to the other, more geologically active satellites.
As a geologically inactive
As a geologically inactive remnant from accretionary epochs of solar system history, Callisto was expected to be a dead, cratered relict, useful only as a contrast to the other, more geologically active satellites.
<triplet> remnant <subject> epochs <object> Entity-Origin(e1,e2)