The energy the Sun produces varies depending on the stage of development. This also changes the elements found in the Sun. The model shows part of the life cycle of a lowmast star like the Sun

Question

How does energy production and the elements present in the star change during the life cycle? Place each piece of data into the model next to the correct stage of the life cycle.

Life cycle stages
Main sentence star
Red giant
Planetary nebula
Energy production elements present

No significant fusion
Fusion in the core
Fusion outside the core
Mostly hydrogen and helium
Mostly hydrogen helium oxygen and carbon
Mostly hydrogen helium oxygen and carbon

Answer 1

Here’s how to place the energy production and the elements present in the star into the model according to each stage of the life cycle of a low-mass star like the Sun:

Life Cycle Stages:

1. Main Sequence Star

   • Energy Production: Fusion in the core
   • Elements Present: Mostly hydrogen and helium

2. Red Giant

   • Energy Production: Fusion outside the core
   • Elements Present: Mostly hydrogen, helium, oxygen, and carbon

3. Planetary Nebula

   • Energy Production: No significant fusion
   • Elements Present: Mostly hydrogen, helium, oxygen, and carbon (as the star sheds its outer layers)

This outlines the changes in energy production and element composition as the star evolves through its life stages.