Aliens: Luis Elizondo hints at evidence of UFO existence
While there has been no direct evidence of aliens – despite countless UFO claims – the sheer size of the Universe suggests life on Earth is not unique. Astronomers use something known as the Drake Equation to calculate how many technically advanced civilisations there are in the Universe.
In 1961, scientist Frank Drake came up with an equation outlining the variables and chances of an alien civilisation in the universe.
It took into consideration factors such as the rate of formation of stars suitable for the development of life in surrounding planets and the number of planets per solar system.
While there is no unique solution for the equation, it is widely regarded as meaning the chances of finding life out there is probable or possible.
One possible solution to the equation is that alien life did exist and has since gone extinct.
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The fact there has been no evidence of aliens is paradoxical, according to astronomers, and can be attributed to the Fermi Paradox.
In 1950, physicist Enrico Fermi – the creator of the world’s first nuclear reactor – came up with a paradox which says due to the age and size of the universe there is bound to be a civilisation much more advanced than ours, which begs the question: “Why is it just us?”
The solution, many scientists argue, is once a civilisation reaches a certain size, it eventually kills itself off, either through war with advanced weapons or natural disaster.
Nonetheless, astronomers are certain life on Earth is not unique.
Chris Impey, university distinguished professor of astronomy at University of Arizona, wrote in The Conversation: “While UFOs continue to swirl in the popular culture, scientists are trying to answer the big question that is raised by UFOs: Are we alone?
“Astronomers have discovered over 4,000 exoplanets, or planets orbiting other stars, a number that doubles every two years.
“Some of these exoplanets are considered habitable, since they are close to the Earth’s mass and at the right distance from their stars to have water on their surfaces.
“The nearest of these habitable planets are less than 20 light years away, in our cosmic ‘back yard.’
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“Extrapolating from these results leads to a projection of 300 million habitable worlds in our galaxy.
“Each of these Earth-like planets is a potential biological experiment, and there have been billions of years since they formed for life to develop and for intelligence and technology to emerge.
“Astronomers are very confident there is life beyond the Earth.
“As astronomer and ace exoplanet-hunter Geoff Marcy, puts it, ‘The universe is apparently bulging at the seams with the ingredients of biology’.”
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