what will happened to te earth if the sun dies???

I'm afraid its "Goodnight Vienna" for us. As this is unlikely to happen for another 5 billion years or so though, there is a fair chance that we will have blown ourselves up or evolved into something a little more intelligent and cleared off elsewhere by the time it happens.

Although the Sun uses up around 5 million tons of hydrogen every second, it still has enough left in its core to last for another 5 billion years or so. When it finally does run out of fuel, though, it will swell up to many times its present size and become what is known as a red giant.

The outer layers of the Sun will grow to swallow up the planets Mercury and Venus and they may even reach out as far as Earth. Way before the Earth is swallowed the surface of our planet will be scorched, its oceans boiled dry and most of the atmosphere will be stripped away.

As a red giant, the Sun might be able to exist for a few more million years. During this time it will shed matter quite quickly. The solar wind will strengthen to a solar gale. Finally, the Sun may cast off most of its outer layers as a bright shell of gas called a planetary nebula.

All that will be left behind is a very hot, dense core. The Sun, in fact, will have become a white dwarf - a star no bigger than the Earth. Gradually, over many millions of years, even this small star will cool. The Sun will end its days quietly as a dimming ember in space.

The attached link shows a photo of a star similar to the Sun in its death throes.

Well let me see now you would be dead in about 2 to 3 hour you would freeze to death. Nothing would grow the would be not moon light at night so it really would be very dark, there would be looting and killing out of this world.

In other word life would ceaseto exsist, because without sun light there is no heat to keep things warm and for the plants to grow.

Plants need sunlight in order to grow so if the sun were to ever burn out well it would be astalavista to everyone on earth. If not in hours it would be days.

But there is the off chance that maybe the brainics of this world could come up with a solution but they could not dottle are take their sweet time it would have to be very quick.

They would have to build huge domes that could keep out cold then they would have to have a artifishal sun artifishal rain if they put their minds to it maybe just maybe the world would not be doomed but that would mean coming to gether as one united world to achive a comon gold and well that would never happen .

But if man united together we would make it.

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.

The Earth would be gone long before the Sun finally went dark.

There is one temporary solution:

We could move off to one of the outer moons in the solar system, perhaps Europa or Titan, and maintain life there while the sun is in its Red Giant phase (and thus providing - for a time - possible present-day Earth-like conditions).

Eventually, we will have no choice but to leave the solar system or face extinction, but we could in theory buy ourselves some time.

Some prominent astrobiologists and astronomers have speculated about this possibility:

See "Ward and Brownlee"

If the Sun dies, Earth will die too. Because the Sun is the main source of energy. For plants, then the animals eat the plants... and so on.

I have an MS in Astrophysics and was salivating at the idea of answering this question. Unfortunatly The Lipsoit guy said pretty much everything I was going to say. So vote for the guy that actually used a source when you choose best answer. Thank you.

The sun dies quite violently so the Earth would be engulfed in a rapidly expanding nuclear reaction and burn

A couple minutes later we'll know and the earth will be fried soon after.

All living things on earth will die... Think, how does the trees fabricate oxygen?