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Is there intelligent life elsewhere in the galaxy?

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tezuka87
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  #1 Old 25-06-2007 Default Is there intelligent life elsewhere in the galaxy?

The odds that there are any signs of intelligent life are expressed by a formula developed by a Frank Drake (co director of SETI (Search for extraterrestrial Intelligence)):
It is known to astronomers simply as the Drake Equation:

N=
(The number of life friendly stars born each year in the galaxy)x
(The fraction of suitable stars that have planets)x
(The number of habitable planets around each star)x
(The fraction of habitable planets that have life)x
(The fraction of inhabited worlds that develop intelligent life)x
(The fraction of intelligent species that develop radio technology)x
The average time span during which civilizations transmit detectable signals)

When Frank Drake and his compatriots plugged their best guesses into the equation, they came up with the answer that intelligent life is common enough that there should be a civilization within about 1000 light years from earth.

Erm, why haven't we made contact then?
What do you all think? Should there be intelligent life elsewhere in the galaxy (or further)? What do you think they would look like? Do you think dragons, unicorns, elves, pixies, and the like may be memories of the past, inventions of human imagination or perhaps, aliens? What do you think of people who claim they have been abducted by aliens? Please share.
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youngyew Male
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  #2 Old 25-06-2007 Default Re: Is there intelligent life elsewhere in the galaxy?

Quote:
Originally Posted by tezuka87
The odds that there are any signs of intelligent life are expressed by a formula developed by a Frank Drake (co director of SETI (Search for extraterrestrial Intelligence)):
It is known to astronomers simply as the Drake Equation:

N=
(The number of life friendly stars born each year in the galaxy)x
(The fraction of suitable stars that have planets)x
(The number of habitable planets around each star)x
(The fraction of habitable planets that have life)x
(The fraction of inhabited worlds that develop intelligent life)x
(The fraction of intelligent species that develop radio technology)x
The average time span during which civilizations transmit detectable signals)

When Frank Drake and his compatriots plugged their best guesses into the equation, they came up with the answer that intelligent life is common enough that there should be a civilization within about 1000 light years from earth.

Erm, why haven't we made contact then?
What do you all think? Should there be intelligent life elsewhere in the galaxy (or further)? What do you think they would look like? Do you think dragons, unicorns, elves, pixies, and the like may be memories of the past, inventions of human imagination or perhaps, aliens? What do you think of people who claim they have been abducted by aliens? Please share.
There are quite a few explanations in the wiki article for the Drake equation:

http://en.wikipedia.org/wiki/Drake_equation
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  #3 Old 04-12-2008 Default Re: Is there intelligent life elsewhere in the galaxy?

as in, information we send now will take 1000 years to reach them and vice versa? Lots of probability and explanation and theories why we haven't "met them", though there ARE the side to contradict that statement too......
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  #4 Old 04-12-2008 Default Re: Is there intelligent life elsewhere in the galaxy?

Quote:
When Frank Drake and his compatriots plugged their best guesses into the equation, they came up with the answer that intelligent life is common enough that there should be a civilization within about 1000 light years from earth.
That really depends on the input, you see. From the Wikipedia article, there are optimistic guesses of up to a million civilizations per galaxy, or pessimistic views that there are only about less that one civilization, on average, for each galaxy.

The problem is with the values inputted. The fraction of intelligent species that develop radio technology? All that is almost purely guesswork.
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  #5 Old 06-12-2008 Default Re: Is there intelligent life elsewhere in the galaxy?

why not we view it like this: the article quoted in wikipedia clearly states that humans have only been searching the skies for ETC since the invention of radiotechnology (I think it was in 1937). Let's say humans send a radiowave transmission in 1937 to outerspace, considering the speed of electromagnetic waves, it would only be 71 years since the radiowaves were transmitted. Searching for a 71 light year radii in cosmological terms would yield not many possible planets which could harbor life, much less intelligent civilization. For example, the nearest star system Alpha Centauri (proxima A and B) is 4 light years away and does not have a nice "comfort zone" (where liquid water can exist) as it is a binary (new researches have found it to be ternary) star system.

Continuing on my argument, this means that there may well be civilization out there but our transmission has NOT reached them. We also haven't taken into account any celestial body that could interfere with our transmission. Eg gravity wells or dark matter etc.

On another note the hypothetical "other beings" may well be awared of the presence of Earth but is located > few hundred light years away. As such they might have sent radio transmissions to our ancestors or are yet to be received by us. Interstellar communication is a tedious task, let's hope quantum entanglement can provide answers to instantaneous data transmissions
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  #6 Old 06-12-2008 Default Re: Is there intelligent life elsewhere in the galaxy?

But this is only considering civilisation that respond to the our electromagnetic waves. What about civilisations that send out signals by themselves?
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  #7 Old 06-12-2008 Default

If I am not mistaken, we have a place, a real large, spacious land where many huge satellite dishes are housed. These plates will serve to receive any waves/signals potentially sent by the extraterrestrial lives out there.

I do believe that we on the planet Earth is not alone in this inconceivably tremendous universe. But, what potential harm do you think those aliens would bring to the Earth if we successfully detected their presence?
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  #8 Old 08-12-2008 Default Re: Is there intelligent life elsewhere in the galaxy?

Quote:
If I am not mistaken, we have a place, a real large, spacious land where many huge satellite dishes are housed. These plates will serve to receive any waves/signals potentially sent by the extraterrestrial lives out there.

I do believe that we on the planet Earth is not alone in this inconceivably tremendous universe. But, what potential harm do you think those aliens would bring to the Earth if we successfully detected their presence?
Well, first, if we were to talk about warring aliens (Krikkiters?) trying to colonize Earth, we must allow for the fact that with such sophisticated technology, and such wrathfulness (that is a word, i hope), shouldn't they have already obliterated themselves already?

Quote:
If I am not mistaken, we have a place, a real large, spacious land where many huge satellite dishes are housed. These plates will serve to receive any waves/signals potentially sent by the extraterrestrial lives out there.
Do you mean the Allen Telescope Array? But then again, it's a radio telescope, so I guess it's something else. Must be from SETI, though.

Last edited by chongkeat; 08-12-2008 at 12:40 AM.
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  #9 Old 08-12-2008 Default Re: Is there intelligent life elsewhere in the galaxy?

ponder this as well...

What are the chances that alien civilization have radio equipments that can difference signals sent from Earth from the background (random) radiation? Considering that the signal power drops by a factor of distance squared it will not take long before it gets too low to be detected above background radiation.

This coupled with the face that our atmosphere absorbs radiation as well might also be the reason why we haven't detected any (possible) signals send by beings from other worlds.
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  #10 Old 02-01-2009 Default Re: Is there intelligent life elsewhere in the galaxy?

What about civilisations which cannot send Radio signals? Maybe evolution prevents such a scenario from happening. After all, evolution is survival of the fittest, and being the fittest does not mean being the most technologically advanced. Just look at what humans are doing to Earth.
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