Question

What is fusion ?
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Answer 1

Fusion is the process that powers the sun and the stars. It is the reaction in which two atoms of hydrogen combine together, or fuse, to form an atom of helium. In the process some of the mass of the hydrogen is converted into energy. ... The sun and stars do this by gravity

Answer 2

Answer:

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Explanation:

Fusion and its counterpart, fission, are two extremes,” Campbell says. Nuclear fission is taking a “big, heavy atom like uranium” and shooting a neutron into it. The neutron does not have an electric charge, so it can easily penetrate the positively charged nucleus of the atom. The extra neutron makes the atom unstable to the point where it splits apart and releases energy. Fusion, on the other hand, involves bringing together atoms of lighter elements, like hydrogen. Since the nucleus of each atom is positively charged, there is a natural force that repels the atoms and keeps them from getting close enough to “fuse.” The fusion process, therefore, must use extreme temperatures and pressures to overcome the forces that naturally want to repel the atoms, and instead push their nuclei together, releasing energy.