Question

scientists used to believe that chemical reactions fueled the sun. why did this lead them to believe that the sun was very young? what kind of reactions do we now think are responsible for the energy released by the sun? in one to two sentences, explain your reasoning (2 points)

Explanation:

Scientists once thought chemical reactions fueled the young sun due to their understanding of energy - producing processes at the time. Now, we know nuclear fusion reactions in the sun's core are responsible for the energy it releases, as chemical reactions couldn't account for the sun's long - term and intense energy output.

Answer:

Scientists once thought chemical reactions fueled the young sun. We now think nuclear fusion reactions in the sun's core are responsible for the energy it releases because chemical reactions could not sustain the sun's energy output over its long lifetime.