aliens

[webby27]

do you beleive? what are your theories?Anyone know any good sites?Thanks

[Loosehead]

They defininately exist, but because of the distances involved we will never be able to see them or contact them, so any aliens you see are entirely the product of the drugs you are taking.

[bernardo]

I believe they probably exist, because there are so many millions of stars which would be suitable for life-bearing planets.  I do not believe they have ever visited Earth.

[THECORBYLOON]

I'm sick of you Earthlings asking this question. Of course we-um um damn! I mean THEY don't exist!!!! (phew think I got away with that)

[justineo]

Sorry webby, don't believe in anything.

[bazwillrun]

Drakes Equation

N = fs * fp * ne * fld * fi * fc * fl
where,
N = The number of communicative civilizations in the Milky Way
fs = The number of stars in the Milky Way
fp = The fraction of those stars with planets (Current evidence indicates that planetary systems may be common for stars like the Sun.)
ne = The number of Earth-like worlds per planetary system
fld = The fraction of those Earth-like planets where life actually develops
fi = The fraction of life sites where intelligence develops
fc = The fraction of communicative planets (those on which electromagnetic communications technology develops)
fl = The fraction of a planet's lifetime that has a technological civilization
If we substitute,
N = fs * fp * ne * fld * fi * fc * fl
N = 400 billion (1/4) 2 (1/2) (1/10) (1/10) (1/100 million)
N ~ 10 technological civilizations in just the Milky Way Galaxy!
What would we do to determine the number of technological civilizations that exists in the Universe? Multiply this by billions; the number of galaxies in the Universe!. Remember this is just for technological civilizations !