The world is going to end --- 7.6 billion years from now, when the sun engulfs the earth in a supernova. Life on earth only has 1 billion years left, buy then the expanding sun will have boiled the oceans away (fish fry). You will still be able to get a tan though, burnt to a crisp -- toasty; just like Quiznos.

The Sun is 4.5 billion years old, and since the birth of the sun it has consumed 1/2 of the hydrogen in the Sun's core. The temperature of the sun is 15.6 million degrees Kelvin at the core which converted to Celcius is 15,699,726.85 C. At the surface the temperature of the sun is 7000 degrees Celcius.