-Under Construction-The Sun is a big ball of fire that would kill you if you went near it, but also keeps alive everything at a safe distance.
The Sun is hot by virtue of the fact of being on fire at all times. Scientists such as Albert Einstein and Reed Richards estimate that the sun is about a billion jillion degrees at it's core, but nearly a fucktillion degrees on the surface.
If it were extinguished temporarily, it might cool off a little, and it might save some of it's finite amounts of gases, but it would also be a terrible idea. As far as we know, the sun actually can't go out, even briefly. If it could and if it did, there would be probably some disasters here on Earth. Like a 60 year-long winter, or zombie apocalypse. If it even dims for long, we're probably screwed.
The sun also kills vampires, as science has already shown us. This is partially because it is made of fire, and fire also kills vampires, but it is also because it emits sunlight, and that definitely kills them. Except that one smartass who made himself tan instead. The sun is tired of that guy.
If you want to go outside, and you are a lightish skinned person or even a white person, you apparently have to buy sunscreen and rub it all over your exposed flesh. This will not make you look less white, but it will stop you from getting cancer, much the same way that sunglasses stop you from getting shot in the eye with a bullet. You're blocking out some stuff, but the dangerous stuff is probably going right through. Try to enjoy your day at the beach anyway.