How is it possible for the luminosity of a protostar to remain (approximately) constant as it becomes a main sequence star?
A. Its surface temperature gets hotter as its size gets smaller.
B. Its surface temperature gets cooler as its size gets smaller.
C. Its surface temperature gets hotter as its size gets larger.
D. Its surface temperature gets cooler as its size gets larger.
Answer:A
How is it possible for the luminosity of a protostar to remain (approximately) constant as it becomes a main sequence star?
A. Its surface temperature gets hotter as its size gets smaller. B. Its surface temperature gets cooler as its size gets smaller. C. Its surface temperature gets hotter as its size gets larger. D. Its surface temperature gets cooler as its size gets larger.