Assertion: comet's outburst | /r/CapableOf | start in december
Facets:
Source sentences:
text: The outburst likely started in December 1990, and then the comet brightened from magnitude 24.3 to magnitude 18.9.
text: The outburst likely started in December 1990, and then the comet brightened from magnitude 24.3 to magnitude 18.9.