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Today: 17 Ramadan 1440
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In 1961, during the space race, the Russian cosmonaut Yuri Gagarin became the first man to orbit Earth, while the
American astronomer Frank Drake developed the now famous Drake Equation. This equation estimates the number of
detectable extraterrestrial civilizations (aprox. 3500) in our Milky Way galaxy, supposing our present electromagnetic
detection methods. The Drake equation states:

N = 

Ns x fp x ne x fl x fi x fc x fL

N = number of alien civilizations in the Milky Way

Ns  = estimated number of stars in the Milky Way; 
fp = fraction or percentage of these stars with planets on its orbits; 
ne = average number of these planets with potential to host life as we know it; 
fl = percentage of these planets that actually develop life; 
fi = percentage of these planets that actually develop intelligence on human level; 
fc = percentage of these civilizations that actually develop electromagnetic radiation emitting technologies; 
fL  = percentage of these civilizations that keep emitting electromagnetic signals to space. This factor is extremely dependent on the lifetime a civilization remains electromagnetic communicative.

 
     
     
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