Assertion: main sequence star | /r/HasAspect | high luminosity
Facets:
value: due to their large exterior surface area
type: CAUSE
Source sentences:
text: Massive main sequence stars can have surface temperatures of 50,000 K. Smaller stars such as the Sun have surface temperatures of a few thousand K. Red giants have relatively low surface temperatures of about 3,600 K; but they also have a high luminosity due to their large exterior surface area.