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Eli
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Israel
Jul 2000
time: 07:30
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Bump.
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Odin
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Biology Nerd at Minnesota State University Moorhead
Sep 2000
time: 23:30
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quote:
Originally posted by lord of the mark
you guys familiar with the rare earth hypothesis?
Says that while life may be widespread, development to intelligence takes a long time. Which require relatively long period without life being wiped out. Which require certain stability in orbits, many other astronomical factors. Which are probably quite rare.
So theres probably intelligent life somewhere out there (there are, afterall billions and billions of stars) but probably not more than a handful of independent starts to intel life in the entire galaxy. Which would mean that not having met up with any isnt all that surprising. |
Familliar with it? I've READ the book.  I beilive there is at least one other world in our solar system with life, Europa. One thing I dissagree with about the Rare Earth Hypothosis is that Photosynthesis is needed for the evolution of Metazoans. I belive that Chemosynthesis is enough to liberate oxygen from CO2. It would be cool if we found complex animals in the seas of Europa.
I think the problem with finding ET is that sentient species are rare, and they don't all exist at the same time. I think there is less than 5 other sentients in the galaxy. I know those alien sightings are fake because the descripitions are too human-like. Who knows, Maybe the first ETs we find are actually quite small, imagine big-brained social insects. 
I think most living things in the universe are made up of similar materials that we are, Nucleic Acids, Lipids, Proteins, and Carbohydrates. This is because the whole universe obeys the same chemical laws, and so one cam imagine the Primordial Soup drifting down into the deep sea and energized by black smokers to form life. The main differences will be in the Bases Of the Nucleic acids and some of the less common amino acids. The simple amino acids such as Alanine and Glycine, are universal.
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KrazyHorse
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Macedonia
May 2001
time: 00:30
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quote:
Originally posted by Big Crunch
If there are inteliigent civilization's out there, why can't we detect them?
I figure everyone might just be whispering. You could have a million people on Earth, spread out every few miles, and they would not be heard, even if they shouted.
I hear a lot about radio and television signals being sent out in to space, and that aliens with 100 light years can now be watching and listening to our broadcasts. How true is this really? Firstly, can anyone tell me how powerful the first radio transmitters were and whether those signals were sent out into space (or just bounced straight back due to the ionosphere). Secondly, I can't even pick up radio or TV station transmission even when I get about 50 miles aways, let alone 50 light years away.
Anyone got any technical and historical knowledge on this stuff. For example, how far away can you pick up a fairly coherent (i.e you can tell what it is and maybe get a fuzzy picture) satellite TV signal assuming it is losing power intensity purely due to the inverse square law. |
IIRC, with our current radio antennas we could pick out other civs putting out signals of the strength we do to a distance somewhat greater than 1000 light years (might have been ten thousand).
Earth puts out as much radio flux as a star.
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Poogas
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http://maddox.xmission.com/aliens.html
Right there is the single reason no alien species has tried to contact us.
But Yes I do beleive givin enough time, we will one day meet up with another group of intelligent beings.
But heres one this I always pondered. Every one says aliens are more intelligent than us with space ships, transporters etc... all that kind of stuff... Well think about this, they had to start from some where right, they had to evolve, so what if we ARE the first to reach that point, what if we are the aliens that are more intelligent than they are. they might not even exsist yet, but when they do and they get to our current level of technology we will have progressed far beyond them, and thus be the stars in all of their sci fi films!
I was joking about the sci fi films, but the rest is actualy how I kinda feel.
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20-08-2003 10:46
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