Why isn’t nuclear fusion possible yet?
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It is very possible.
Just look up at the sky and you will see nuclear fusion going on right there. It is how the Sun and Stars work.
We can also do it briefly here on earth in thermonuclear weapons.
We can also do it for slightly longer labs, but right now we are not yet at a point where we can keep it going and actually get more energy out of it than they put in.
The problem (one of the many, many problems) is that fusion usually happens at a the sort of temperatures that you get inside stars and that you need to use a lot of energy to heat things up to that level and keep that hot stuff contained.
Fusion at temperatures closer to what you have here on earth. So called “Cold Fusion” would be really cool to have but nobody quite knows if it is possible at all and how to do it if it is.
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