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
What happens when nuclei collide?
In a fusion reaction, two light nuclei merge to form a single heavier nucleus. The process releases energy because the total mass of the resulting single nucleus is less than the mass of the two original nuclei. The leftover mass becomes energy.
What happens when two neutron particles collide?
Einstein's theory of general relativity predicted that when two neutron stars collide, they would generate a gravitational wave, a ripple in space time.
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