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We get the energy from fission. To put two hydrogens together to turn it into one helium is the very definition of fusion.
Separate but related: among the many mind-blowing astronomical discoveries of the past decade or two, kilonovas are in the short list for most spectacular.
Imagine two tiny neutron stars plowing into each other, all those densely packed neutrons suddenly and with great force being clumped together into super heavy elements, creating a spiral spray of silver, gold, platinum, uranium nuclei, but just the neutrons.
With time, some of these neutrons decay into protons, or absorb whatever hydrogen atoms they encounter along their path - a proton and an electron - along with whatever random free electrons may also be around, floating freely in space.
Eventually you'll get the full atoms. Some of that bounty got caught in the gravity well of the gas and dust nebula that collapsed into our solar system.
And that's how the universe created the silver, gold, titanium, uranium, etc, that is in our planet today.
I wasn't going to go into all the details about fusion just convey the point that it's difficult. Maybe I should have said difficult to control.