What will happen to the sun when fusion from hydrogen into helium slows down?

The Sun is a main-sequence star, and, as such, generates its energy by nuclear fusion of hydrogen nuclei into helium. In its core, the Sun fuses 620 million metric tons of hydrogen and makes 616 million metric tons of helium each second.

the body's situation won't change the forces are equal opposit and on the same body

i don't know that i agree with that but what's the question ?