what will happen to our earth when the sun dies alone?
80050
the sun will become a red giant before it gets near death, it will actually expand and the planet earth will have been eaten up and incinerated well before the suns death . such is the life cycle of all stars.
185980
Our sun will not supernova.  It will, over a very long time, expand into a relatively small red giant, which will have a diameter greater than the Earth's orbit.\n\nLong before that the Earth will have become far too hot to live on, but the process will be very, very slow -- it'll take over a billion years -- not a giant explosion.\n\nSorry to disappoint you.  I know, you sound like you were looking forward to it.  Funny how many people answering this question think otherwise.  I guess that's the irony of the internet for you.\n\nSee the link below for all the details:
563951
The sun will not become a black hole, it is not currently massive enough.\nThe sun will "die" by first expanding into a red giant and finally cool down to become a white dwarf.
289825
Our sun does not have enough mass or density to go nova.\n\n"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.\n\nAs 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.\n\nAfter 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.\n\nThen 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.\n\nMost 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!\n\nThe 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)."\n\n---and---\n\n"Our star, the sun, was born in the heavens about 4.5 billion years ago. Our sun is about 1/3 of the way through its expected life. Scientists are now predicting the following events during the remaining life of our star:\n\n    * In the next 1.1 billion years, its brightness will increase by 10%. This will super-heat our planet as a result of a severe greenhouse effect. All of the oceans on earth will boil away and all life will be destroyed.\n\n    * In about 6.5 billion years, our sun will double in brightness and use up all of its supply of hydrogen fuel in its core. This will cause the sun to begin swelling as it uses hydrogen from the layers surrounding the core.\n\n    * In about 8 billion years the sun will swell to 166 times its present size. This giant star will swallow up Mercury, Venus, and maybe even our Earth. Our sun will then be what scientists call a Red Giant because it will be very large and red in color.\n\n    * After all hydrogen fuel is used, the sun will begin to use helium as its fuel. This fuel will burn very quickly and only last about 100 million years.\n\n    * In about 12 billion years, the sun will eject much of its outer layers and become a smoldering, collapsed core that scientists would call a White Dwarf."
813348
No one is really sure yet. Astronomers and meteorologists are working everyday to figure out what is going to happen but the only theory is that....\n1- The earth stops rotations and can cause us to die\n2- The earth can get compressed into a small cubical.\n3- Nothing at all and we still live... which i hope is this.
737950
The sun is very gradually getting hotter. In about 5.6 billion years, most of the oceans will have boiled and most life on Earth will be gone.\n\nIn about 12.233 billion years, the sun will start to run out of fuel and become a red giant star. It will expand until the outer surface is somewhere between the present location of Earth and Mars. All life on Earth will end.\n\nThis will be because there is no more hydrogen left to make into helium in the core of the sun. When this happens, the sun will start to collapse (not enough force from core pushing out) until it starts fusing helium! This will result in a very dense and unimaginably hot core that produces so much energy that it pushes the outer layers of the sun out to where Earth is now.\n\nIn 12.365 billion years it will run out of helium too and blow its outer layers off entirely when it starts fusing heavier elements. The end result will be a white dwarf (large ball of slowly cooling fusion waste) and a very pretty, very large bubble of glowing gas that will look something like this:\n\nhttp://www.edwinhubble.com/hubble_gallery/planetary_nebula_IC_418.htm\n\nFor the complete past, present and future of our sun, click here:\nhttp://www-astronomy.mps.ohio-state.edu/~pogge/Lectures/vistas97.html
761531
If this happen?\nNo more people alive, and no more earth planet survive -\nBye, bye. . .
893208
Our star, the Sun (Sol), is a G-2 class star.  Eventually it will deplete its hydrogen (H), converting into a helium (He) cooler burning star.  When this occurs it will be a cosmocataclysmic and extinction level event as far as the Earth is concerned, for the Sun will hyperdialate 100 times its mass into a Red Giant Star, engulfing the orbit of the Earth.  This event will generate a spontaneous stellar radiation burst, frying half of each planet, and generating a powerful shock wave causing atmospheric violence and may even dislodge planets out of their orbits to realign in new orbits around the Red Giant.  Hence, because the orbits of the planets are not stationary, the Earth most likely will survive when the initial shock wave hits our planet, perturbing its orbit away from the expanding stellar mass, but still it will precipitate an extinction level event that will lay down a new Carboniferous Layer to the Geological Column.\n\nNext, after about one million years our Red Giant will deplete its helium, and due to its enormous mass gravity will cause the star to collapse, thus “crunching” and compressing its internal molecular structure into a White Dwarf Star, while it simultaneously explodes its outer shell, the photosphere, in a sudden catastrophic multi-shock wave event called a “Nebula Discontinuity Event”, or merely a “Nebula”.  This will simultaneously create a Local Compression Bubble around our region of the Galaxy.  Only larger Red Supergiants, not smaller Red Giants, undergo a supernova event and become Neutron Stars or Black Holes.  The new White Dwarf will have the mass equal to the size of the Earth, yet it will retain the electromagnetic field of its original G-2 class star phase.  The nebula event will most likely incinerate the planets with X-ray radiation causing sterilization on Earth, generating another extinction level event.  The shock waves will concentrically disperse the planets outwardly from the smaller cool burning White Dwarf, and Earth will become a dead frozen planet.
759134
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.\n\nAlthough 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. \n \nThe 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.\n\nAs 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.\n\nAll 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.\n\nThe attached link shows a photo of a star similar to the Sun in its death throes.
610802
I used to think so too but recent research suggests that mass lost from the Sun earlier in its red giant phase will probably cause the Earth's orbit to move further out, preventing it from being engulfed. But we don't know that for sure. The answer will show itself 5 billion years from now. As to what will happen to our grand grand grand children...only God knows the answer.
1066916
Absolutely. \n\nIt's where our future lies, whether we render this planet inhospitible by ourselves or through some natural disaster, that's where we'll have to go.
1067509
That sounds like a nice book, although it is total crap.\n\nWhen the Sun starts to run low on hydrogen, it'll swell up to beyond the orbit of Earth, and possibly Mars. Long before that, the Earth will heat up and simply melt away, the minerals and everything else will be blown away by the solar wind...\n\nAbout 4.5 billion years from now.
177229
The human race will survie with great difficulty. The average temprature of earth will plumit to near Zero degrees. World Strom Systems will become depleted of Water vapours thus creating huge famine all over the world.
26143
the earth will probably not exist in the same fashion as it does today.  a meteor will probably hit us and start the life cycle again in the next 200 mill or so.  Probably more water and less land so i figure more water based life will exist
111381
As the Sun uses its hydrogen feul, the buildup of helium will cause the Sun's luminosity to increase, giving off more heat and radiation to the Earth.  Eventually, the heat will melt the polar caps, increase evaporation of the oceans, and turn the Earth in to a greenhouse.  Water vapors will later escape the Earth and effectively turn the Earth into something like the Venus of today.  At that point, temperatures will already be too high for life to continue.  \n\nAll of this will happen before the Sun even becomes a Red Giant (its hydrogen runs out).  The expansion of the Sun will consume and incinerate Mercury and Venus, and COULD potentially do the same to the Earth.  But, the mass lost that will occur when the Sun becomes a Red Giant will cause the diameter Earth's orbit to expand and thus barely escaping the surface of the Red Giant Sun.\n\nLife will all be incinerated by that point (approximately 7.5 billion years from now).  The only strategy is to migrate to Mars, or some how find a way to transfer Jupiter's gravity to pull the Earth away from the Sun and closer towards Jupiter.
26003
Absolutely.  \n\nHow long depends on what you consider destroyed.   Chances are we'll be long gone before the planet is left abandoned by our own dieing sun which is about 1/2 way through it's life cycle.  From the linked Wikipedia artical, it claims that the earth won't be engulfed and vaporized by the sun, but it won't be a good thing one way or the other.\n\nWhat happens after we have no sun is tough to say, but you could probably argue that at that point if not long before the earth would be unable to support life.
292425
Well, very interesting question I must say. Our Sun was formed about 4600 million years ago and will continue to give out energy for an equal period of time. So, the earth is safe for the next 4600 million years. Phew!!\n\nBut, if you want to know what will be the fate of our sun (or any star for that matter) after it enters the final stages of its life, then read on.....\n\n(1) The first phase will be THE RED-GIANT PHASE. In this phase, the fusion reactions in the core of the sun will stop and it will start shrinking, this will disturb the equilibrium of our sun and it will start expanding like crazy to re-adjust it. Its color will change to red & it will become very very VERY big!\n\n(2) Now, the second stage will be the WHITE DWARF STAGE. Here, the expanding outer shell will be removed eventually and the shrinking Helium core will shrink into an extremely dense ball of matter due to gravitation. The helium nuclei will start to fuse together to form Carbon nuclei & will release tremendous amount of energy in the process & the sun will start glowing white.\n\n(3) Ultimately, the helium fuel will burn out & the sun will fade into space as a dense lump of matter.\n\n\nBut, if we consider the case of a much bigger star (even bigger than our sun), we'll find more final stages. Those stages will be- \na) Supernova- exploding star\nb) Neutron star- After explosion\nc) Pulsar- A spinning neutron star\nd) Black hole- Formed by an indefinite contraction of a heavy neutron star.\n\n:) Hope you enjoyed all the info :)\nHave a nice day