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(YouTube)   Aliens: They are out there   ( divider line
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4425 clicks; posted to Video » on 01 Mar 2014 at 10:11 AM (4 years ago)   |   Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»


Aliens: They are out there

Humans have pondered about the prospect of alien life for centuries. The famous question of 'Are We Alone' have pricked at scientists' minds and stupefied the public, mainly because we don't have a definite answer.

But let's look at things from a different perspective. Life on Earth exists under many different conditions, conditions where human can't possibly survive under. There are fish that live thousands of miles underneath the sea, where pressure reaches the most extreme. There are thermophiles that live in extremely hot conditions. And there are anaerobic organisms that do not require oxygen. And so, seeing that life can exist under these conditions, we don't have to stretch our minds to wonder where we might find them next.

In 1991, an astrophysicist named Frank Drake came up with an equation to predict the number of active, communicative, alien civilizations that exists in the Milky Way.

The Drake equation is:

N = the number of alien civilizations in our galaxy with which radio-communication might be possible (i.e. which are on our current past light cone);
R* = the average rate of star formation in our galaxy
fp = the fraction of those stars that have planets
ne = the average number of planets that can support alien life per star that has planets
fl = the fraction of planets that could support alien life that actually develop life
fi = the fraction of planets with life that actually go on to develop intelligent alien life
fc = the fraction of civilizations that develop a technology that releases detectable signs of their existence into space
L = the time for which such alien civilizations release detectable signals into space

Plugging in suggested values, scientists have calculated with uncertainty the value of N, and suggested that there are around 1000 -- 100,000,000 alien civilizations in the Milky Way.

Even though the Drake equation has stirred up controversy since its many factors are still unknown, there's a high possibility that we're not alone. I mean, just think about it this way: our solar system is one out of a billion solar systems in the Milky Way, and the Milky way is only one out of a billion galaxies in the observable universe, not the entire. There's got to be something out there.

Music Attribution:
Aurea Carmina Kevin MacLeod (

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