Why is the sun hot?

Question

How did it get so hott & heat up in the 1st place?

How does it gett hott enough to heat the earth?

Answer 1

because

Answer 2

The sun is a big gas bag. mostly Hydrogen and some Helium. Then there is gravity. it works something like this the closer you are to another body the stronger it gets. If you double the distance the power of attraction falls to 1/4. So the further away you are the weaker it gets. So the atoms in the center of the sun are actually touching. Another rule. The higher the pressure, the higher the temperature. All matter has an ignition temperature. Wood ignites at a few hundred degrees centigrade. Hydrogen needs millions of degrees Centigrade. When the temperature -because of the pressure due to gravitational attraction in the center of the sun- reached the critical point, Hydrogen atoms ignited. about 10 billion years ago. A by product is Helium. Even though the core of the sun's temperature is measured in 10s of million degrees centigrade the surface of the sun on average is about 6000 degrees.

Answer 3

Energy production

The energy of the Sun is produced by the conversion of hydrogen into helium. For each hydrogen atom converted, one neutrino is produced. These neutrinos are detected, but less than the expected number. See also Neutrino; Solar neutrinos.

The material at the center of the Sun is so dense that a few millimeters are opaque, so the photons created by nuclear reactions are continually absorbed and reemitted and thus make their way to the surface by a random walk. The atoms in the center of the Sun are entirely stripped of their electrons by the high temperatures, and most of the absorption is by continuum processes, such as the scattering of light by electrons. Because there are so many absorption and emission processes along the way, it can take as long as a million years to complete the random walk to the surface.

Answer 4

(m)

The question is, on the face of it, almost insane. No-one could possibly doubt that the sun is the only source of external heat on earth. And, certainly, the part that we see, the sun's photosphere, is some 5,800 degrees Kelvin. The solar corona, which extends into space, may be as hot as one million degrees Kelvin. But what exactly is underneath this hot atmosphere? The explanation universally accepted without question is that it must be an even hotter mass of hydrogen gas, fusing into helium and other elements at temperatures of 15 million degrees Kelvin in a continuous thermonuclear explosion -- a giant H bomb.

This universal view is based on the mathematical work of Arthur Eddington in the 1930s and Hans Bethe's theoretical confirmation in the 1950s (for which he won the Nobel prize in 1967). Above all else, we have the overwhelmingly awesome experimental confirmation of the nature of nuclear fusion by the test detonations of H bombs in the Pacific.

However, physicists have always been aware of nagging problems with the conventional view of how stars form and how they burn. And now, Italian physicist Renzo Boscoli, has published details of a theory that is staggering: the theory that far from being hot underneath its atmosphere, the sun may, at its core, be a ball of ice in which not hot, but cold fusion reactions are taking place.

The conventional view of how stars form is that a cloud of interstellar hydrogen collapses under gravity until, under enormous pressure, the atoms of hydrogen become so hot they fuse to form helium. Once ignited, the core of the newly formed star burns continuously, transmuting hydrogen to helium, helium to carbon and so on, until the fuel is exhausted and the star's life is over.

Answer 5

The sun is classified under yellow star. Stars like our sun have a life time of 10 billion years.and our sun is about 5 billion years old. the sun is so hot may be at the surface like 6000 degree celicious.But at the core 7000000 take any degree. The earth is heated by the sun primarily due to light .That is one mechanism of heat transfer. The cause of suns heat is nuclear reaction not Saddam's. The concept of nuclear reaction is Professer Albert Enstines famous formula
E=mC^2
you betta read about that my sunny hot freind

Answer 6

when neutrons....which are blue
and protons..... which are red
fuse togeter it becomes helium, when helium activates it turns into light.
which is fire !
called energy actually .
and this process is called nuclear fusion .
all coming from the core, which is like a power plant .

how does it get hot enough to heat the earth ?
the size of the sun is a massive star and we are much smaller .

to see the actual size here is a picture ..

http://ali.apple.com/space/space_images/Sun_and_earth.jpg

you'll see earth is a tiny size to the sun
which is a monstrous size .

such as a pea and a basket ball placed together . that is a tiny pea against that giant basketball ! !

One hundred and nine Earths would be required to fit across the Sun's disk !!

That's why it gets hot enough to warm the earth! !

Answer 7

The heat comes from a combination of gravitational compression of hydrogen molecules to the point where fusion into helium occurs, and the actual fusion itself

Answer 8

It is all about e=mc2

Energy is heat.
The sun produces immense amount of energy because it burns it's fuel in immense sums, hence, enormous amount of heat.