when will the sun burn out?will it take a couple of billion years? give me a proper answer?

Answer 1

The Sun's current age, determined using computer models of stellar evolution and nucleocosmochronology, is thought to be about 4.57 billion years. The Sun is about halfway through its main-sequence evolution, during which nuclear fusion reactions in its core fuse hydrogen into helium. Each second, more than 4 million tonnes of matter are converted into energy within the Sun's core, producing neutrinos and solar radiation. The Sun will spend a total of approximately 10 billion years as a main sequence star.

The Sun does not have enough mass to explode as a supernova. Instead, in 4-5 billion years, it will enter a red giant phase, its outer layers expanding as the hydrogen fuel in the core is consumed and the core contracts and heats up. Helium fusion will begin when the core temperature reaches about 3×108 K. While it is likely that the expansion of the outer layers of the Sun will reach the current position of Earth's orbit, recent research suggests that mass lost from the Sun earlier in its red giant phase will cause the Earth's orbit to move further out, preventing it from being engulfed. However, Earth's water and most of the atmosphere will be boiled away.

Following the red giant phase, intense thermal pulsations will cause the Sun to throw off its outer layers, forming a planetary nebula. The only object that remains after the outer layers are ejected is the extremely hot stellar core, which will slowly cool and fade as a white dwarf over many billions of years. This stellar evolution scenario is typical of low- to medium-mass stars.

Answer 2

THE DEATH OF THE SUN
The Sun is about 4.5 billion years old. it has used up about half of its nuclear fuel (hydrogen). In about 5 billion years from now, the sun will begin to die.
As the Sun grows old, it will expand. As the core runs out of hydrogen and then helium, the core will contact and the outer layers will expand, cool, and become less bright. It will become a red giant star.
After this phase, the outer layers of the Sun will continue to expand. As this happens, the core will contract; the helium atoms in the core will fuse together, forming carbon atoms and releasing energy. The core will then be stable since the carbon atoms are not further compressible.
Then the outer layers of the Sun drift off into space, forming a planetary nebula (a planetary nebula has nothing to do with planets), exposing the core.
Most of its mass will go to the nebula. The remaining Sun will cool and shrink; it will eventually be only a few thousand miles in diameter!
The star is now a white dwarf, a stable star with no nuclear fuel. It radiates its left-over heat for billions of years. When its heat is all dispersed, it will be a cold, dark black dwarf - essentially a dead star (perhaps replete with diamonds, highly compressed carbon).

Answer 3

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RE:
when will the sun burn out?will it take a couple of billion years? give me a proper answer?

Answer 4

The sun is burning by the nuclear fusion of hydrogen which continuously is converting into helium. When the sun will not get any hydrogen left then it will gradually burn out and decrease in size forming a black hole. As to the size of the sun it contains much hydrogen to sustain up to a couple of billion years.

Answer 5

Since the Sun is an Average star,it will be another five billion years before it completely runs out of fuel and usues the ashes to make the heavier elements .during that time it would have become a redgiant blowing off it's layers of gas until it' completely expels it leaving a nebula and a white dwarf

Answer 6

The Sun will definitely burn out but not explode( Nova) since it is within Chandrashekars limit.

It will become a white dwarf after about 5 billion years more.
But before that it would expand to form a red giant engulfing mercury ,venus, earth, at around 4.5 billion years.
Then its outer shell will collapse and it would become a whit dwarf.

Answer 7

about more 5 billion years.

Answer 8

This follows the following law

Size of stars is inversely proportional to life of stars...so sun being a smaller star will lasts for more than 5 billion years.

Answer 9

How dare you expect a "proper answer" if even the best scientist do not know exactly ??
The up to date estimate is it will take about (another) 5 billion years from now before "our" Sun is done.
Besides, the Sun doesn't burn ... fusion is happening there, that is NOT burning.

Answer 10

The answer by 'Som' above (2nd answer) is 100% accurate based on current scientific data. Whoever gave his answer a bad vote is an idiot.