Physics, 25.01.2020 05:31 swaggernas

As you learned in part b, a non-burning helium core surrounded by a shell of hydrogen-burning gas characterizes the subgiant stage of stellar evolution. as time goes on, the star continues to evolve, and eventually, it becomes a red giant. rank the stages a star goes through as it evolves from a subgiant into a red giant, from latest to earliest. a) the shell of hydrogen surrounding the star's non-burning helium core ignites. b) pressure in the star's core decreases. c) pressure from the star's hydrogen-burning shell causes the non-burning envelope to expand. d) the star's non-burning helium core starts to contract and heat up. e) the star becomes a red giant. f) the surface of the star becomes brighter and cooler.

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