Assertion: comet | /r/HasProperty | noticed by casual observer
Facets:
Source sentences:
text: Approximately once a decade, a comet becomes bright enough to be noticed by a casual observer, leading such comets to be designated as great comets.
text: There is no official definition; often the term is attached to comets such as Halley's Comet, which are bright enough to be noticed by casual observers who are not looking for them, and become well known outside the astronomical community.
text: Approximately once a decade, a comet becomes bright enough to be noticed by a casual observer, leading such comets to be designated as great comets.
text: About every decade or so, a comet will become bright enough to be noticed by a casual observer—such comets are often designated Great Comets.
text: Approximately once a decade, a comet becomes bright enough to be noticed by a casual observer, leading such comets to be designated as great comets.