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Do aliens exist?

Conventional wisdom has it that aliens should be either everywhere or nowhere. Many scientists throughout the world are trying to solve the mystery of ALIENS. One great scientist Frank Drake has provided us with the probabilistic argument used to estimate the no. of active extra-terrestrial civilizations in our milky way galaxy. He gave the Drake equation:

N = R∗ .fp .ne .fl .fi .fc .L

 
Putting the values, it is found that there are probably 1000-100000000 civilizations in the milky way galaxy.
Then, the question arises:
 
ZOO HYPOTHESIS AND FERMI PARADOX:
Fermi paradox is the apparent contradiction between the lack of evidence for extraterrestrial civilizations and various high estimates for their probability. There are billions of stars in the Milky Way similar to the Sun. With high probability, some of these stars have Earth-like planets, and if the Earth is typical, some may have already developed intelligent life. Some of these civilizations may have developed interstellar travel. Even at the slow pace of currently envisioned interstellar travel, the Milky Way galaxy could be completely traversed in a few million years. 
# The Zoo Hypothesis speculates on the assumed behaviour and existence of technically-advanced extraterrestrial life and the reasons they refrain from contacting Earth. The hypothesis is that alien life intentionally avoids communication with Earth, and one of its main interpretations is that it does so to allow for natural evolution and socio-cultural development, avoiding interplanetary contamination. A fundamental motivation for the zoo hypothesis would be that premature contact would "unintelligently" reduce the overall diversity of paths the universe itself could take.
#  According to the Kardashev scale, the types of civilizations are:
Type-1: A planetary civilization; can use and store all energy available on its planet.
Type-2: A stellar civilization; can use and control energy at the scale of the stellar system. 
Type-3: A galactic civilization; can control energy at the scale of its entire host galaxy.
We are in the early stage of Type-1 civilization. It may be possible that these highly advanced civilizations may live in another dimension that we don’t know till now.
# Another hypothesis includes The Great Filter Hypothesis. This hypothesis shows the stepwise evolution of civilization. According to this hypothesis, with no evidence of intelligent life other than ourselves, it appears that the process of starting with a star and ending with advanced life must be unlikely. This implies that at least one step in this process must be improbable. This step is called the Great Filter.  
 
So, until we naturally evolve to an advanced species, we are less likely to see Aliens. 

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Source: 
www.wikipedia.com; www.waitbutwhy.com

RATNASANU PAL
MECHANICAL 1st Year


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