Assertion: sunspot | /r/CapableOf | appear as dark patches
Facets:
value: on the solar surface
type: LOCATION
Source sentences:
text: Sunspots, which appear as dark patches on the solar surface, form where the sun's magnetic field is unusually strong, and the number of sunspots waxes and wanes in a cycle that lasts about 11 years, fueled by fluctuations in the sun's magnetic field.