cant repeat the same process twice!,
nuclear fusion reaction
Cold fusion is a theoretical nuclear reaction that occurs at room temperature, unlike traditional fusion reactions that require extreme heat. In cold fusion, hydrogen atoms combine to form helium, releasing energy in the process. If successfully developed, cold fusion could provide a clean and abundant source of energy, potentially revolutionizing the field of energy production by offering a sustainable alternative to fossil fuels.
The absorption of a free moving neutron by the atom's nucleus
Martin Fleischmann and Stanley Pons proposed cold fusion in 1989, although it was proven to be an invalid concept that did not work.
The fusion of Hydrogen into Helium causes heat and radiation to occur.
I found the website K1 Project very helpful. They had several articles underneath their Learn/Energy tab which should answer any questions about nuclear fusion.
One good reason-it has not been made to work yet! We do of course use solar energy which is produced by nuclear fusion
No, not yet. Maybe in another 20 years when its perfected (which they have been saying every 20 years since they originally began work in the 1950s on lab prototypes of controlled nuclear fusion reactors for power generation).
The stars produce their heat from nuclear fusion reactions. Work on earth to produce controllable nuclear fusion is concentrating on one particular reaction, between deuterium and tritium, because it is the easiest to get going (though hard enough!). Stars operate with other reactions but all of the nuclear fusion type. You can read more in Wikipedia 'Nuclear fusion'
The first work on nuclear fusion was performed in 1933 by Ernest Rutherford. The first nuclear fusion "reactor" was built in 1947 by teams in the UK and USSR. To this day no nuclear fusion "reactor" has been able to produce more energy than had to be put into it to get the reaction started, despite many different experiments on many different designs.
It hasn't been achieved yet, and it seems doubtful that it is possible. You may want to read the Wikipedia article on cold fusion to get a more detailed overview. To summarize it: the muon-catalyzed kind definitely is possible and is routinely done by researchers in the field - the problem is that it requires more energy to generate the muons than you can get out of the fusion. The Fleischmann and Pons kind appears to have been poor laboratory technique (I'm being charitable here, and not suggesting that it was deliberate fraud).
We don't know much about fusion as it is still very experimental. It will not produce the dangerous fission products that fission does, but it may have other dangers unknown as yet. Nuclear fusion has more destructive potential than fission. Fusion is the principle powering the H-bomb developed in the Cold War. Just to put the power of a Fusion bomb in perspective, it is detonated by a fission bomb half the size of the one dropped on Japan. THAT'S JUST THE DETONATOR.