Question

why does the Sun will not shine like it does now after 5 billion years?​

Answer 1

Answer:

To put numbers on this, when the Sun was formed 4.5 billion years ago it was about 30% dimmer than at present. At the end of the next 4.8 billion years, the Sun will be about 67% brighter than it is now

Answer 2

THIS IS PROBABLY BECOZ AFTER YEARS LATER THE LEVEL OF POLLUTION WOULD BE MORE THAN IT IS NOW SO THE BRIGHTNESS OF THE SUN WILL NOT BE THE SAME DUE TO THE DUST AND SMOG