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The Fermi Paradox states that given the technological advancement and imperialistic desires of human beings who live in a fairly young planetary system, aliens from other highly advanced star systems should have visited earth already and even conquered the Milky Way galaxy if they desired.
As that has(apparently) not happened yet, the Fermi Paradox, initially quoted by Italian physicist Enrico Fermi, hypothesized that there are no advanced civilizations in our galaxy.
The main hypothesis of the Fermi Paradox, debated by many Scientists, states that we are the only advanced civilization in our galaxy, because if aliens exist, they would have found our planet by now.
The four arguments against this hypothesis of us being alone in the universe are:
Early studies focused on water to determine if the planet can sustain life. Now they have finally realized that water is just one small indication of life, and exoplanets can have plenty of other forms of life, without H2O.
Similarly the definition of alien life can be an extraterrestrial being, or even bacteria. The earlier studies which only focused on earth-like planets and stable solar systems due to a better chance of finding habitable zones, have now broadened their vision.
Newer, bigger and better space telescopes are being launched by NASA and the European Space Agency to better understand the astro-biological life in the universe, and even our own galaxy.
The odds of advanced or intelligent life in the Milky Way is calculated by the Drake Equation, which puts the figure at 10,000 civilizations trying to communicate.
Various global agencies have been working to find intelligent life outside our solar system using telescopes, radio signals and other means, but the aliens are still eluding us for thousands of years.
The missing aliens have dampened the enthusiasm but the search continues.
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