How to Turn Off the Sun?

If you put a bunch of iron in and a jiser like floats around the surface for a while, the sun will just burn away. Happily, the iron won't fuse, but the helium and the hydrogen inside of it still will. But if that iron gets to the core and a sort of pushes out the hydrogen, then that really will disrupt the burning of the sun. So that's one way to turn off the sun, just give it some iron supplements. The other thing is, you don't really need iron. There are other things that are too heavy for our sun to fuse. And our star is not big enough, not hot enough at its core to fuse things like