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OpenStudy (anonymous):

An astronomer see a star that is very far away but still very bright. What can she conclude about the star? The star must be very large. The star must be very small. The star must be moving away from Earth. The star must be moving closer to Earth.

OpenStudy (anonymous):

This is an easy one!

OpenStudy (anonymous):

c?

OpenStudy (anonymous):

I think it's a large object far away - light intensity drops off with the square of the distance so if it's still bright then it's got to be really big.

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