Measurements Indicate That a Certain Star Has a Very High

question 158

Multiple Choice

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) The star must be quite small.
• B) The star must be very large.
• C) There must be an error in observation because no star can have these properties.
• D) The star must be in the upper part of the main sequence.

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