Funny you should mention that – the Sun will destroy the Earth in about 4.6 billion years!!!
The Sun currently works by fusing hydrogen together, which is what generates all of the light and heat that is essential for us here on Earth.
However, in about 4.6 billion years, the Sun is going to run out of hydrogen in its core, and it will move in to fusing helium. The problem for us is that, for the Sun to fuse helium, it has to get a lot hotter in the core and it will produce a lot more energy – meaning the Sun will expand and swallow us up!!