Assertion: comet's effect | /r/HasProperty | easy to identify
Facets:
Source sentences:
text: In addition, outgassing would have altered 'Oumuamua's rotation period, an effect that "would have been easy to identify," Loeb said.
text: His reasoning centered on the fact that outgassing would have altered the visitor's rotation period — an effect that should have been easy to identify but wasn't seen.