fission reaction

Chinese researchers are developing a 1.5 megawatt reactor that will be as tall as a 20-story building when expanded, allowing for round-trip travel between Earth and Mars.

The fusion reaction, or fusion reaction, nuclear fusion reaction in physics, is the process of two nuclei fusing together to create a heavier new nucleus.

What loses is only equivalent to about 0.0000000000001% of the Earth's volume.