Question: "How hot is the sun."

Oliver George answered on 19 Jun 2014:

Like the Earth (and something you just got out of the microwave) the Sun is way hotter inside than on the surface.

At the surface the Sun is about 5,500’C, or about 22 times hotter than your oven and 4 times hotter than the melting point of steel. This is pretty hot, yeah? Well it’s nowhere near as hot as you might think.

The core of the Sun is much much hotter than this. It can be as hot as 15,000,000’C! This is because the core of the Sun is under so much pressure that it forces atoms together releasing huge amounts of energy. This is the opposite of what happens in a nuclear reactor. In a nuclear reactor atoms are split apart in a process called nuclear fission. Forcing them together is known as nuclear fusion. Some physicists are working on getting fusion working on Earth so we can use it as an energy source. Right now though it takes so much energy to force the atoms together that it just isn’t efficient. In a decade though you might find your computer being powered by nuclear fusion, the same energy source that powers the Sun!

I was going to say that the core of the Sun was way hotter than anything on Earth but then after some internet searching I found out that this isn’t actually true. Some scientists in America were working with plasma (a fourth form of matter!) and X-rays and accidentally produced a superheated gas that was 2,000,000,000,000’C! More than 100 times hotter than the Sun!