Seems to me it comes down two thing, how much life is in the universe, and our ability to look for it.
For the first part, obviously nobody can say for sure (for now) how much life there is in the universe, but you could make a guess as how many inhabited planets there are. There is a scientist who developed an equation to predict this, basied on the number of stars, planets per star, percentage of planets that could support life, and the percent that would. Seems logical but that's a lot of guesswork, and depending on how generous you are you can get a wide range of answers. I can't remember the guy who came up with the equation, the exact equation, or it's exact predictions, but I do remember the conclusion was there were so many solar systems in the galexy, even with a very small chance per life per planet, it was still highly likely there would be at least some life on another planet.
Then of course we are limited by our ability to find this life. Other planets are unimaginably far away from us, and our ability to observe them is extreamly limited. If there is life out there, we simply might not be able to find it, with the technology we have. Any other civilization out there would face the same problem, it would be equaly hard from them to find us. Then you have the problem if they are less developed technologically than us, lowering our chances even more.
So, when you consider that there probably somekind of life out there, it is also probably too far away, for us to find, or for them to find us, if "they" are even developed enough to.
2007-04-14 19:49:14
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answer #1
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answered by eviljebus 3
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It needs to be in a stable solar system, like ours, on a planet with a large moon, probably, in an orbit with low eccentricity at a distance where water can remain liquid, and with a single star system, not too dissimilar to our sun, with a lifetime of 10 billion years, approximately. Nothing like that around here, except Earth. The Drake equation was created several decades ago, and current Astrobiological theory rates it as having been too simplistic, and early estimates wildly overoptimistic. In this galaxy at this time, the number of planets an unprotected human could live on indefinitely (with adequate food) is probably in single figures.
2007-04-15 00:21:56
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answer #2
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answered by CLICKHEREx 5
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Oh my gosh. Someone forgot to tell you. The reason we haven't found life on any other planet yet is that we have been looking at all the places that don't have life first. In that way we can completely rule them out as having life forms completely.
There are a lot of places that don't have life, so we will need to do a lot of checking before we turn our attention onto those places that do have life. If you don't believe me, just look at the lists of places NASA directed astronomers have looked so far. Did any of them have life forms? Of course not. Those are the ones that don't have life forms and they checked out correctly.
2007-04-14 19:36:20
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answer #3
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answered by zahbudar 6
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first one thing is clear there is no life form in our solar system.
how could we come to this conclusion, we are able to probe these planets. the all other planets in the universe are more than a light year away, so it is very hard to probe them[it takes to much time and it's costly] that's why we can't find life in other planets.but i can say one thing there is definitely some life in the other planets. one day we would be able to find our neighbors or they would come for us.
2007-04-14 22:52:00
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answer #4
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answered by ASHOK 2
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Because we can't find a planet with life on it.
There is no doubt many exist but we just may never receive any proof that intelligent life does exist.
Hopefully one day we will.
2007-04-15 04:01:34
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answer #5
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answered by Billy Butthead 7
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Do you think that they would tell us,
There is life on other planets Nasa and the Goveronment will never tell us that.
The moon landing was FAKE in the 60s they never went they lied.
If they realy did go there they would have seen this planet X,this is planet wormwood it is in the bible it is gonna hit us
2007-04-18 05:31:23
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answer #6
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answered by ? 2
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Probably cus life on other planets isn't the same as life here. And that's why they can't recognize it.
2007-04-14 19:31:32
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answer #7
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answered by namojaro 3
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Suitable conditions for life like water, pure air, etc., are not present collectively on other planets.
2007-04-14 20:10:40
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answer #8
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answered by Kinshuk 2
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Mainly because every other solar system is further than a light year away. Every other planet in our solar system probably doesn't hold life, although we are checking.
2007-04-14 19:30:06
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answer #9
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answered by Anonymous
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cause life is a complex and delicate process and even if have all the elements for life, still have to have the right conditions and suitable environment to support life and sustain
2007-04-14 19:30:53
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answer #10
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answered by Courageous Capt. Cat 3
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