Question

using figure 1 and figure 4, predict the most likely events that will result when o the end of the proton-proton fusion process.
move the correct answers into the boxes. not all answers will be used.
most likely events
drag & drop the answer
the production of light by the sun will cease.
the chemical composition of the suns core will begin
to change.
the sun will begin to transform into a planetary
nebula.
the sun will continue to produce heavier elements.
the circumference of the sun will change.

Explanation:

1. The chemical composition of the sun’s core will begin to change: Proton - proton fusion in the Sun's core converts hydrogen into helium. When the fusion process (at the end stage) occurs, the core's chemical makeup (more helium, less hydrogen) changes.
2. The sun will continue to produce heavier elements: After hydrogen fusion (proton - proton), the Sun will start fusing helium into heavier elements (like carbon, oxygen) in later stages of its evolution.
3. The circumference of the sun will change: As the Sun's core composition changes and fusion processes evolve, its internal pressure - gravity balance shifts. This causes the Sun to expand or contract, changing its circumference (e.g., in the red giant phase, it expands).

The option "The production of light by the sun will cease" is incorrect because the Sun will still produce light during subsequent fusion stages. "The sun will begin to transform into a planetary nebula" is incorrect as the planetary nebula stage is much later, after the red giant phase and when the Sun has shed its outer layers, not directly at the end of proton - proton fusion.

Answer:

1. The chemical composition of the sun's core will begin to change.
2. The sun will continue to produce heavier elements.
3. The circumference of the sun will change.