How does nuclear fusion actually work and why is it so hard when we already have nuclear fission?

Question

How does nuclear fusion actually work and why is it so hard when we already have nuclear fission?

In: 2

Answer 1

Fission works with big atoms that don’t want to hold together, so they’re easy to split.

Fusion works with small atoms that really don’t like each other, so it takes extreme environments to get them to combine, like stars or particle accelerators.