The suns core is the innermost portion of the sun. It's the hottest layer and under the highest pressure, enabling nuclear fusion to take place, which produces the energy.
Fusion in the core of the sun is mostly the process of hydrogen to helium fusion, or more accurately believed to be the fusion of 1|1 H (hydrogen) into 4|2He (helium). This is thought to occur at the...
The core can't "die" but I suppose you mean if the fusion reaction were to suddenly stop (and not be able to start again). Well, since the fusion is what keeps the sun supported, it would collapse on...
the sun would become wildly unstable and expand. if the did come under control it would probably be due to the temperature dispersing through the larger sun, then gravity wold cause it to shrink back...
If the core of the sun didn't exist we would be in some sort of weird parallel universe where the laws of physics were radically different. If you somehow managed to magically remove the core of the...