what happens to our Solar System including the Earth, when our Galaxie collides with Andromeda in future?
139768
By the time that happens the Earth will have already been destroyed by the sun. But if the Earth was still around, it is highly unlikely that we would collide with any matter at all, since space is mostly just dust and emptiness, believe it or not. We would likely have a higher-than-usual amount of dust moving about the solar system, however.
429942
an end...overpopulation etc...where can we live?  there are no other earths out there in space...(if we try to settle on saturn, we'll go right through the planet)  our food supply going down, energy being doomed. etc
1091211
not for billions of years. And actually there will be almost no impact on either galaxy, other than one of them, or both, being mis-shapen by one another's gravity pull. Actually it is possible for galaxies to collide and not have one star hit another because galaxies are mostly empty space believe it or not. But the person above is also right, the gravitational tug on eachother could spark new star forming regions. even if we live that long, and say the sun is still around, meaning the planets are too, then our solar system will most likely not be affected. Also to add, the universe is expanding, but on the larger scale. Galaxies normally live in clusters and within clusters galaxies can collide and merge, but on the bigger scale the galaxy clusters are moving away from eachother.
12821
The greatest threat to Earth is from a collision with another large object...an NEO from within our solar system or an “alien” one from outside.  When galaxies and stars collide, they merge over time and energy and matter are mostly conserved.  When terrestrial objects collide, there is destruction and the release of energy.  For an organic biosphere such as Earth's, a collision with an object about 10 miles wide would vaporize our atmosphere and oceans, and leave the Earth in a state similar to the moon.  Even a 150 meter wide object (currently undetectable) could destroy a major city.  It is only a matter of time until a collision with an Armageddon-size-object and the Earth occurs.  Hopefully humanity will be PREPARED to defend itself when the time comes.
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.
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
1077025
It won't really matter as the sun will become a red giant just before it dies, enveloping most if not all the inner planets. When it does actually die it will go nova, blowing off most of its outer layers. This will most likely destroy all the inner planets that survived the red giant phase and eject the outer planets from our solar system (if it doesn't destroy them as well). \n\nLife on Earth can in no way survive this. After all this has finished our sun will most likely become what is known as a white dwarf  and will have about half it's current mass. Gravity will still exist but at half its current force. Any planets that stayed in orbit during the violence of our sun's nova would probably slowly increase its orbit until it just wanders off into space.\n\nI wouldn't worry about this too much as we've got abut 4 billion years to wait, give or take a couple million years.
376755
Nope, nothing that we have found will be coming very near us on that date.  Just to give an update on the object the Braxton_Paul mentioned, 2004MN4 (now designated 99942 Apophis), has pretty much been put into the clear for the close approach in 2029.  It will come close, but unless something funny happens to the orbit (collision, unexpected outgassing phase etc), it will miss us.\n\nWhat we are trying to get a fix on now is the next close pass by this bad-boy: 2036.  We can't rule out an impact probablitity for that encounter yet.
611914
Sun explode. Sun go out. Ceres-sized bolide hit Earth.\n\nNo disease, weather or ecological phenomenon could completely wipe us out. Even we couldn't wipe ourselves out; we are just to numerous and smart.
96467
Our Sun will "burn out" in about 4.5- to 5.0-billion years from now.\n\nRight now the Sun is converting hydrogen into helium at a rate of some 600-MILLION metric tons per second. Once this main fuel source is exhausted, the Sun will begin fusing helium, and once that's gone it will "burn" progressively heavier and heavier elements. Each change in fuel will be accompanied first by a diminishment in size, then a period of swelling. Mercury, Venus, and Earth will be consumed. Finally nothing but iron will be left to burn in the Sun, and since the energy required for that is higher than the Sun can generate, it will gradually dwindle more and more in size until it will become what's called a 'white dwarf' star.
412196
Not in our lifetime.  It takes 1,500 years for it to complete its eliptical orbit between our Sun and a dead sun outside our galaxy.  We have a better chance meeting helpful space visitors before planet X will return.
526019
The previous post explained the matter so precisely and accurately that I applause for the writer =D\n\nAnyways, in my opinion, since the universe is so vast and that the galaxies are spaced so far from each other, even if the Andromeda appears to be gliding toward our Milky Way for a final collision, there is a huge chance that Andromeda will miss us completely, probably by quite a few millions of light-years. Or it may pass by our galaxy, stirring the locations of the stars and twisting the shape of our spiral. \n\nIn order for Andromeda to collide with Milky Way DIRECTLY, the chances of that would be... about the chances you can score a bull's eye with a normal dart aiming for a square inch of area on a target board as vast as the entire New York City from a manned space shuttle in orbit. Now the chances of that is not really big x.x
492408
in our solar system 12\nin our galaxy 245658421\nin whole world 87541245632156125
530869
If you mean our Solar system (there's other suns with planets revolving around them) then our Solar System is in our Galaxy...The Milky Way.
250469
i agree debris would be the larger problem in the near future.\nIts all about time scale and which two planets, it might not affect our lifetime. On the other hand our neighborhood as become pretty calm and not so much traffic as when the planets were forming, I suspect it will only get calmer and more boring unless the sun does some crazy stuff.
309539
of course there is. ramdom events of shifting meteors, meteoroids, asteroids , and comets make it nearly impossible to tell when one will come our way. but rest assured that the probability is extremely small. if you were to say within the next thousand years then it could happen. the next million it will most likely happen. the only satellites in our solar system that we have to worry about reside in the oort cloud, some as big as texas, and these could conceivably be knocked out of orbit into a collision course, but again i wouldn't worry. the thing that would most likely happen would be a rougue comet or meteor from somewhere outside of local space to come careening in our direction stirring up all sorts of havoc along the way. does that answer your question?
480364
Yup. The latest will be 5 billion years from now, give or take a few hundred thousand. By then the sun will either:\n\n1) engulf our planet (very unlikely, but will come close enough to vaporize our planet)\n2) Die and not engulf or vaporize our planet and within days our atmosphere will freeze and fall to the earth in the form of ice.