Imagine That a Year from Now You Read That Astronomers

Imagine that a year from now you read that astronomers have discovered a group of
50 billion-year-old stars.What would you conclude from such a discovery?

A) They must be spectral class O and B stars
B) They must be in a late stage of stellar evolution
C) Our present ideas on evolution of the universe are seriously in error
D) We would have to revise our theories of stellar energy sources

Correct Answer:

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