Arrange the following stages of stellar evolution in order, from earliest to lat

Question

Arrange the following stages of stellar evolution in order, from earliest to latest: A. A star with no nuclear reactions going on in the core, which is made primarily of carbon and oxygen. B. A star of uniform composition from center to surface; it contains hydrogen but has no nuclear reactions going on in the core. C. A star that is fusing hydrogen to form helium in its core. D. A star that is fusing helium to carbon in the core and hydrogen to helium in a shell around the core. E. A star that has no nuclear reactions going on in the core but is fusing hydrogen to form helium in a shell around the core.

Explanation / Answer

Arrangement from earliest to latest:-
B. A star of uniform composition from center to surface; it contains hydrogen but has no nuclear reactions going on in the core. This is a protostar.
C. A star that is fusing hydrogen to form helium in its core. This is a main sequence star.
E. A star that has no nuclear reactions going on in the core but is fusing hydrogen to form helium in a shell around the core. This is an orange giant.
D. A star that is fusing helium to carbon in the core and hydrogen to helium in a shell around the core. This is a red giant.
A. A star with no nuclear reactions going on in the core, which is made primarily of carbon and oxygen. This star is at the end of the red giant stage.

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