Question

Why scientist conform the sun future 5000 billion years in light through why how is it possible

Answer 1

well it's possible to understand how it's is done the thing you need are this
1.volume of sun that can be calculated
2.amount of helium and hydrogen gas present in sun
3.knowledge of nuclear fusion reaction
after calculating the mass of gases use the Einstein formula of
E=MC^2
to calculate the total energy radiated by sun when calculated divide it with the
1.23×10^35(which is the total energy release by sun in one year ) then you get the time sun can burn for