QUESTION 39 After a star has left the main sequence the star a contracts throughout b. expands throughout c. contracts a

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Question 39 After A Star Has Left The Main Sequence The Star A Contracts Throughout B Expands Throughout C Contracts A 1 (55.7 KiB) Viewed 98 times

QUESTION 39 After a star has left the main sequence the star a contracts throughout b. expands throughout c. contracts at the center while the surface expands d. expands at the center while the surface contracts QUESTION 40 What observation leads us to the inference that stars evolve? a. they have different spectral classes. b. they have different luminosity classes. c. they have different masses. d. they shine. QUESTION 41 When the sun goes from the main sequence to the red giant stage a. the core gets hotter and the surface gets hotter b. the core gets hotter and the surface gets cooler c. the core gets cooler and the surface gets hotter O d. the core gets cooler and the surface gets cooler