Where does fusion happen in the universe?

Answer 1

Do you know what nuclear fusion is?
It is the process when two nuclei combine to create a bigger and denser nucleus.

Where does it occur?
It occurs in the universe and in labs. The process of fussion can be found in stars. That is why when you look up to stars in the night, they are bright. They use fusion to convert matter into light.
Also...
It also happens in "labs", where scientists make fusion occur in hydrogen bombs. Scientists are finding a way to make hydrogen bombs to be controlled while using fusion, because not all things that are radioactive are able to be controlled. They also believe that powerful energy will be released from the bomb "but" with very little pollution, not like other bombs that polluted the environment where they were tested at.

Answer 2

Fusion occurs in the cores of stars, where the extreme heat and pressure allow hydrogen atoms to combine and form helium, releasing a tremendous amount of energy in the process. This process of nuclear fusion is what powers stars and makes them shine.