We Are Almost Certainly Not Alone In The Space Video

The existence of extra-terrestrial life is one of the majority compelling debate in science. When we ask "Are we alone?", we are wonder about how life itself begins, and what our place and purpose is in this universe.
A latest paper, published in Astrobiology, uses the majority recent discoveries of exoplanets to estimate the likelihood that other technologically advanced civilizations have still existed. The authors’ pessimistic limit is that humanity is single if the odds of an advanced civilization existing on a planet is less than one possibility in about 10 billion trillion.
“One in 10 billion trillion is very small. To me, this implies that other intelligent, technology producing species very likely have evolve before us,” said Adam Frank, lead author of this study, in a statement.

Think of it this way. Previous to our result, you’d be considered a pessimist if you imagined the probability of evolving a civilization on a habitable planet was, say, one in a trillion. But even that guess, one possibility in a trillion, implies that what has happened here on Earth with humanity has in fact happened about 10 billion other times over cosmic the past [owing to the estimated number of stars and planets in the universe]!”
This chance was constructed from the famous Drake Equation, a probabilistic argument to how likely or not intelligent life is. The Drake equation uses seven probabilistic parameter to obtain an estimate of the figure of civilizations in the Milky Way. The reason of it was never to provide a precise number, but to stimulate the discuss about alien life.
 In the paper, Frank and his colleague Woodruff Sullivan simplified the equation considerably. The number of superior civilizations is equal to the figure of habitable planets in a given volume of the universe multiply by the likelihood of a technological species arising on one of these planets.

The likelihood is clearly a matter of guesswork, but by expecting humans to be only, they were able to give their pessimistic limit.
“From a fundamental viewpoint, the question is ‘has it ever happened anywhere before?’” said Frank. “Our result is the opening time anyone has been able to place any empirical answer for that question and it is astonishingly probable that we are not the just time and place that an advance civilization has evolved.”