will humns ever have to leave earth?
218336
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.
657482
Of course, we're heading to the end of the world...in a few billion years, when the sun expands and consumes our planet along with the other inner planets. All life on this planet will be extinguished well before that happens. However, human beings may very well extinguish their civilization and themselves sometime in the next few centuries. The problem is not the science. Of course, many well-respected scientists have been speaking out on the problems humanity faces. While some, like James Lovelock, may think we have already passed the point of no return; other scientists argue that we are still within a narrow window of opportunity to halt and perhaps even reverse the destructive policies and technologies that are presently damaging the environment. \n\nThe real problem is humanity, its cultures, and its governments. Most people around the world still hold a world view based upon ideas that were held to be valid back in the Stone Age... many people even believe that some supernatural agency will rescue humanity and clean up the world as soon as things have gotten as bad as they can get. Meanwhile, most governments base their decisions upon corporate interests and upon national interests... thus more global problems and their solutions are pretty much ignored. Short-sightedness is the overwhelming curse of humanity and its institutions.\n\nLife will continue in one form or another on this planet, whether there are human beings there to observe said life or not.
394940
Well astronomers think the expansion of the universe is actually accelerating, so what you are proposing probably will never come to pass.  Anyway for a civilization to survive a "big crunch" if it happened, would have to far far far more advanced then anything we could possibly imagine.
87918
Yes man will get to mars and probably all the other planets, but no I don't think we will ever live on another planet!
672740
All we have to do is survive long enough to expand into space. I think if we did that, it would be hard for anything to stamp out all the pockets of humans around. Especially if we could figure out how to not die as individuals.
276604
No. And the loss of their satelites would be temporary at best. They could just rocket up new ones.
5648
No, never.  The best we could hope for is a minimal occupation but Bush, or any future president will have to leave people where they are.
163377
None at all. The human gives himself too much importance. Essentially, the role of mankind is as unimportant as the role of rocks, mosquitos and, actually, anything in the universe. However, mankind would not survive had it accepted the absolute pointlesness of its existance and so, our elevating of humanity's status above something what it really is seems only natural.
657711
you already answered your own question.  not as long as religious zealots roam the Earth!!
378379
We could terraform Mars and probably Venus and make them liveable if we really wanted to.  And, we could set up colonies and humans could live there and raise families.  However, if you're talking about mass emigration, e.g. the relocation of humans to another planet, that's a completely different question.  \n\nThink about this.  The largest ocean vessels we can build today are the Nimitz-class aircraft carriers.  They carry a crew of 5000.  Without the aircraft and supplies, they could carry 10,000 to 12,000.  \n\nLet's assume that we could build a space craft capable of moving 10,000 people from Earth to Mars and that we have 1000 of them.   And, let's assume that it takes a month to make the round trip.\n\n1,000 ships x 10,000 people x 12 months = 120 million people per year.\n\nThere are 6.6 billion people on Earth.\n\n6.6 billion / 120 million = 55 years\n\nSo, it would take 55 years to move our population to Mars.  It just isn't feasible to move humans elsewhere on an emergency basis as you suggested.  Think how much fighting there would be to get on one the ships.\n\nWe would need a number of very advanced technological breakthroughs to make it happen.  Examples: room-temperature superconductors, propellant-less (gravitic?) propulsion.\n\nIf you are on Earth when the giant comet or asteroid hits, you're just doomed.  Colonies on other planets would be our insurance policy against loss of our species, but not the loss of our individual lives.
345614
depends on how the aliens are and how advanced they are. If they came across issues like race, war, discrimination, they probably arent much happier but if they were more like our earth's animals, but with advanced technology I'm sure their life is much better not worrying about being popular, fitting in, crime, etc. etc. we"ll never know until we can travel at light speed though and even then, not in our life span.
2819
Yes, earth is moving closer to sun every year, and eventually it will get destroyed one day. But still thousands of years are left for this to happen.
141513
They can never escape. as to where they go? no one knows. Check out space.com it is a very informative site.
543189
it won't be for a long time from now, like 1000s of years, but it will happen.  Planets are basically stars and stars burn out sooner or later.  If it isn't earth that ends first, it'll be the sun that burns out and we can't survive without the sun.
219107
Humanities future may be in the outer space at some time in the future. It is quite possible earth may become unsuitable for living due to our own making (like nuclear war or green house effects etc.)\nTrips to mars are perhaps a step towards finding a suitable place where mankind could survive and continue to prosper.\nThis research must go on even though expensive.
422428
Yes.\nNext major race after humans disappear
462641
Must have been some terrific star ship if one ship could help earth people kill everything in the universe.\nSince we can see out 13.8 billion light years, that's a heck of a lot of space to rocket around in to find everything to kill.\nBut since there are still some earth people left, maybe we'll just repopulate the universe.