Throughout its existence, a low- to medium-mass star like the Sun undergoes a series of predictable structural and nuclear transformations. Place the following stages of a Sun-like star's evolutionary life cycle in chronological order from earliest to latest.
- 1Stellar nebula condensing and collapsing into a protostar
- 2Main sequence star fusing hydrogen into helium in its core
- 3Red giant expanding after core hydrogen depletion
- 4Planetary nebula shedding outer gas layers into space
- 5White dwarf cooling as a dense, hot carbon-oxygen core remnant
Cevap
Stellar nebula condensing into a protostar → Main sequence star fusing hydrogen → Red giant expansion → Planetary nebula shedding outer layers → White dwarf cooling core remnant
The chronological sequence begins with gravitational collapse within a stellar nebula to form a protostar. Once core hydrogen fusion begins, the star spends most of its life on the main sequence. After core hydrogen is depleted, it expands into a red giant. The pulsating outer layers are subsequently cast off as an expanding planetary nebula, leaving behind only the hot, dense core as a cooling white dwarf.
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Evolutionary life cycle sequence of low-to-medium mass (Sun-like) stars
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