Nuclear fusion is the process by which two or more light atomic nuclei combine to form a heavier nucleus, releasing a huge amount of energy in the process. It happens naturally in stars under extreme pressure and temperature.
Scientists are trying to bottle that same process inside special machines (like tokamaks or stellarators). That’s why people call fusion “making a star in a bottle:. All to chat with Luke O'Neill Professor of Immunology at Trinity College Dublin.
