Measurements indicate that a certain star has a very high intrinsic brightness (

Question

Measurements indicate that a certain star has a very high intrinsic brightness (100,000 times as bright as the Sun) and yet is relatively cool (3500 K). How can this be? A) There must be an error in observation, because no star can have these properties. B) The star must be very large. C) The star must be in the upper part of the main sequence. D) The star must be quite small. Measurements indicate that a certain star has a very high intrinsic brightness (100,000 times as bright as the Sun) and yet is relatively cool (3500 K). How can this be?

Explanation / Answer

The star must be very large.

large is grater than small star of same temp

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