Assertion: twin jet nebula | /r/CapableOf | refer by that name
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: The Twin Jet Nebula is sometimes called simply the Butterfly Nebula, but should not be confused with NGC 6302, a bipolar planetary nebula in Scorpius, more commonly known as the Butterfly Nebula, or any of the other nebulae sometimes referred to by that name: