Astronomers estimate that the sun has enough fuel for hydrogen fusion to last another years.

The answer that best fits the blank is 5 BILLION. It is estimated for another 5 billion years that the Sun would still have enough fuel for hydrogen fusion. This fusion that occurs in the sun is what we are experiencing now which is its radiance and this is a very strong energy that is able to reach us. Hope this helps.

Did you know it's illegal to own only one guinea pig in switzerland?   : )

Ithink i might know wait one second let me serve