Why do thermonuclear reactions in the Sun take place only in its core?

Answer 1

Fusion requires high temperature and pressure that only exist in the core. Scientists on Earth trying to make fusion reactors cannot duplicate the high pressure in the core of the Sun, so they compensate by making the temperature even higher. That is right, a running fusion reactor contains a plasma hotter than the core of the Sun, but at low pressure.

Answer 2

The above solutions are spot on. it extremely is extremely worth noting that the hydrogen (and sometime helium etc) that are fused interior the middle is in simple terms interior the middle. The famous individual has layers of which the middle is the considerable one. each and every of the hydrogen interior the the remainder of the famous individual (approximately ninety% of its finished mass) by no skill is going in to the middle to be fused. The center has what it started out with and that's it. at last the solar will blow off its outer layers and that hydrogen could sometime variety right into a sparkling famous individual.

Answer 3

In order for hydrogen nuclei to fuse, they need to overcome the electromagnetic barrier, because hydrogen nuclei are just protons, with positive charge. As you know, two like charges repel. To overcome this strong repulsion, incredible energies are required to get the protons moving quickly enough. Even at the millions of degrees K in the centre of the sun, probabilistic quantum tunnelling is still required for enough of the protons to cross the energy barrier and be fused by the strong nuclear force, producing the energy. Only at the incedibly high energies at the centre where gravitational energy provides the starting energy for fusion can protons fuse.

Answer 4

because it's only in the core that, due to gravitational pressure, you find the material (hydrogen) concentrated enough, and at a high enough temperature, so nuclear fusion can happen

Answer 5

they usually require the intense pressure and atomic weight and heat the core provides for the chemical reaciton needed

Answer 6

Pressure on the surface is not great enough.