It certainly can. It can also occur at lower or higher temperatures.
15 MK is roughly the core temperature of the Sun. At this temperature the PP chain is dominant, with the CNO cycle contributing roughly an order of magnitude less energy. At around 17 MK the two are roughly equal, and at higher temperatures the CNO cycle becomes dominant.
Much below 4 MK, you're not normally going to get significant fusion (there are "cold fusion" techniques that can happen at much lower temperatures, such as muon-catalysed fusion, but these aren't net producers of energy: it takes more energy to make the muons than you can get out of the resultant fusion reaction).
No place, we have not yet determined how to make a fusion reactor. Only fusion bombs.
Yes, but on earth we are limited in size
Nuclear fusion is the process that powers stars, such as our sun.
nuclear fusion is when 2 hydryon atoms combine or FUSE together. when this happens the neculous combine therefore causing nuclear fussion which releaces masses of heat and light enegry that radiates to earth
No, while it is hot enough the pressure is too low.
nuclear fusion is not a natural occurrence, it is when two atoms are fused together
No place, we have not yet determined how to make a fusion reactor. Only fusion bombs.
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Sun
In the cores of stars and hydrogen bombs.
Because the conditions of temperature and pressure that occur in stars do not occur on earth
yes nuclear fusion does occur on the sun, creating intense heat and light
It has to be at hundreds of millions of degrees kelvin, before a fusion reaction between deuterium and tritium will start
Not nuclear, it takes an extremely hight temperature for Fusion to occur with in the sun or any other star. ADDED: Yes "nuclear". Fusion is one of the two type of nuclear reaction, the other being Fission.
Transitions between various stages of electron excitement.
Natural nuclear fusion reactions occur in all stars
Yes, but on earth we are limited in size