2007-09-27 05:31:52 · 20 answers · asked by madnsane 2 in Science & Mathematics ➔ Astronomy & Space
http://answers.yahoo.com/search/search_result;_ylt=Ak2eUxaB_q1hMX.PsfM0XbIazKIX;_ylv=3?p=aliens
Astronomy has nothing to do with alien questions. They belong under the Alternative category in Paranormal Phenomena.
I don't believe that you have a proper understanding of what a galaxy is. Interstellar space travel may be accomplished by a very advanced civilization which has developed propulsion systems capable of such very long distances.
Distances between galaxies are truly immense. I find it hard to imagine ANY civilization attempting inter-galactic space travel no matter how extremely advanced they may be.
Detecting possible life-bearing solar systems on another galaxy is impossible.
We may be able to detect similar planets to ours in nearby stars of OUR galaxy, but why would one risk venturing to that system HOPING that the planet was indeed able to support life forms, able to support us, and able to support an intelligent species that would be peaceful. All the while remembering that no matter what you find on the planet, if anything, you need to make the trip back home again.
Intergalactic travel would be more than an open experiment- it would be foolhardy. Even an alien would know that.
2007-09-27 06:15:45 · answer #1 · answered by Troasa 7 · 0⤊ 1⤋
Well some people say they do!
Just kidding, those people are all morons. The fact is its hard to detect alien life. We're a very young species in terms of technology but as far as we know its not possible to travel faster than the speed of light - now the galaxy is over 100,000 light years across. If an alien species was far away, say 60,000 light years - it would take that long for our first signals to reach them - assuming they'd be able to detect them at all. We've been broadcasting (mostly crap but dont get me started on TV) for about 100 years. So thats a pretty small bubble (100 light years) around which any civilisations might have detected us.
If an alien species were technologically adept they could probably do all their experiments without us ever finding out about them, they'd probably take one look at us and decide we were far too primitive to try and communicate with.
There are billions of stars in our galaxy, and there may be many millions of planetary star systems. I expect there is life on a great deal of them. Its far too soon to make an educated guess though about when we're likely to encounter another sentient race.
2007-09-27 07:41:09 · answer #2 · answered by Leviathan 6 · 0⤊ 0⤋
Given the size of the universe and the billions of other galaxies, I'd be surprised if we were the only accidental form of life. But imagine how long it would take to get here, or for us to go anwhere else.Even if we had lightspeed. You'd leave your planet and galaxy for a visit. In your high tech sportscar. But you'd arrive at your neighbours place in a Roman chariot.Because in the time it would have taken to get there, they'd have invented a whole lot of new stuff and society might have changed. Anyway don't worry about it.
My friend the Doctor tells me it'll all be ok.
2007-09-27 06:20:07 · answer #3 · answered by Anonymous · 0⤊ 1⤋
The probability that other intelligent life exists 'out there' is almost a certainty. As to why they haven't come to Earth....
Maybe they have the same kind(s) of problem(s) covering the distances involved as we do. Or maybe they're just not interested in us. It's an interesting question. Their evolutionary path would be totally different from ours. Maybe they're body chemistry isn't even built on the same elements as ours is. We have life forms here, on Earth, that live under some pretty extreme conditions.
Doug
2007-09-27 05:42:47 · answer #4 · answered by doug_donaghue 7 · 3⤊ 0⤋
If (and I say 'if' only on a rhetorical level) there are other intelligent life forms outside of our own Milky Way galaxy, the distances that would need to be traveled are absolutely immense.
I am of a firm belief that there HAS to be life outside of this little rock we live on, but the Universe is so huge that we may never, ever know if someone aside from us lives to populate it.
Openly experiment? Let's just find out if there's anyone out there first...
2007-09-27 05:40:09 · answer #5 · answered by Bobby 6 · 2⤊ 0⤋
There probably are "aliens" from other galaxies, but why would they want to spend billions in developing the technology to travel millions of light years across the universe to visit a grubby little planet on the outskirts of a galaxy which is, itself, on the edge of it's galaxy cluster and is infested by mainly moronic life-forms?
2007-09-27 05:41:09 · answer #6 · answered by the_lipsiot 7 · 4⤊ 0⤋
From other galaxies? That would be a very long trip, and they would probably have to get within 100 light-years of Earth (that's the approximate size of the electromagnetic bubble around us due to radio transmissions) to notice there is life here. That's like finding the proverbial needle in a haystack.
2007-09-27 05:40:57 · answer #7 · answered by BNP 4 · 5⤊ 0⤋
well... there's always the possibility that they are not that advanced yet... and if they are, they may not want to interfere with how life is on earth so they can study it, like how scientists sometimes do with how bears live and hunt, or when they find a 'new' ancient tribe say in the middle of the amazon...
i'm not saying that aliens have come to earth, and i'm not saying that they haven't.. i'm just saying that i believe in the existance of other living, thinking creatures out there... if not, it's be an incredible waste of space.. hehe..
2007-09-27 05:39:28 · answer #8 · answered by ais 3 · 2⤊ 0⤋
They probably don't know there is life on earth and don't have the technology to travel such long distances.
2007-09-27 05:36:32 · answer #9 · answered by Gustav 5 · 3⤊ 0⤋
If there is other life forms more then likely they are billions of light years away from the earth.
Some of the stars that have burned out, that we can now see has happened before the earth had been formed. They are so far away. Our universe is very big, and still expanding.
2007-09-27 05:43:38 · answer #10 · answered by krennao 7 · 1⤊ 2⤋