Question: i've heard all about how the world will end in 5 billion years (something like that) is there any way scientists can stop it?? :)

Jen Gupta answered on 16 Jun 2011:

I guess you’re talking about the world ending because the Sun will expand into a red giant star and engulf us. Well the reason that the Sun will turn into a red giant is because it will have used up all of its hydrogen so I guess if we can inject more hydrogen into the Sun then it would keep on fusing hydrogen together to form helium like it does at the moment to produce energy. However I would imagine that the Sun burns up millions or billions of tons of hydrogen every second so we probably wouldn’t actually be able to do this!