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Heat, derived from gravitational energy. The gravitational collapse of the original nebula of gas and dust produced very high temperatures and a "protosun".
Eventually the protosun became a star (our Sun) when the nuclear fusion reactions began at temperatures of millions of degrees Celsius.
What else can I help you with?
Is fusion a chemical a mechanical or a nuclear?
Fusion of smaller atoms to form larger atome is a nuclear change. Ex: 4 hydrogen atoms FUSE to form an atom of helium through a compeles set of nuclear reactions.
Is fusion a mechanical or chemical or nuclear?
Fusion of smaller atoms to form larger atome is a nuclear change. Ex: 4 hydrogen atoms FUSE to form an atom of helium through a compeles set of nuclear reactions.
Do fusion reactions provide nuclear power?
No, a fission reaction is not necessary to trigger a fusion reaction, but for us on earth, it is. In the field of nuclear weapons, a fission bomb is needed to create the heat necessary to set off a fusion weapon. We have to use fission, or, rather, the energy created by that, to initiate the fusion reaction. It might be possible to use a high power source, like a laser, on a small amount of material to get fusion to occur. But we are still experimenting with this in the Tokamak, and it's far from being a done deal. Stars are, in general, massive nuclear fusion reactors. Their constant consumption of fuel powering their high rate of fusion creates a massive amount of energy, and the stars' huge gravity keeps this process from blowing the whole thing apart. No fission is needed to sustain this reaction.
Can you set off a nuclear bomb with an x ray?
no!
What happens when a nuclear bomb is set off?
It explodes.
Who set off the first nuclear bomb?
US, who else?
What year did atomic scientists set off the first nuclear test in the Mississippi?
There were no nuclear tests in Mississippi.
Why do they set off nuclear bombs?
During World War 2 they set them off to test them, and to make Japan surrender unconditionally.
Who didn't do what they where supposed to do and set off a nuclear bomb?
Am not aware of any accidental nuclear explosions. Anywhere. Ever.
How are hydrogen bombs set off?
A small nuclear trigger (the primary) inside the weapon is exploded and used to generate energy, which is used to compress another device (the secondary) inside the weapon. This energy causes the secondary to collapse on itself, initiating a fusion reaction in the fusion fuel (Lithium6 Deuteride) contained in the secondary.
3 advantages nuclear fusion has over nuclear fission?
The binding energy (Strong Atomic Force) released is much greater when fusion occurs than when fission occurs. As an example, that is why fission bombs typically have yields around 100 to 500 kilotons of equivalent TNT, while fusion bombs typically have yields in the 25 to 50 megaton range. The problem is that fusion requires a lot of energy to initiate - in fact, most fusion bombs use a fission bomb to set them off.
How many nuclear bombs have been set off in history estimates will suffice?
You can count them yourself in the related link on The Nuclear Weapon ArchiveA Guide to Nuclear Weapons
