Assertion: planet's atmosphere | /r/HasProperty | primary
Facets:
Source sentences:
text: Unlike giant planets (which have a primary atmosphere), terrestrial planets have a secondary atmosphere.
text: Unlike giant planets (which have a primary atmosphere), terrestrial planets have a secondary atmosphere.
text: This also differentiates them from gas giants, where the planetary atmospheres are primary and were captured directly from the original solar nebula.
text: Terrestrial planets also have secondary atmospheres, which are generated through volcanism or comet impacts.