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New research shows that other technologically advanced civilizations apart from our planet may have existed in our universe, but they are most likely extinct or were young to have had communication with us.
Many scientists are still reluctant to acknowledge extraterrestrial life, but researchers from the University from Rochester reveals that the probability of highly-advanced aliens is still high.
Using a simplified from of Frank Drake's Drake Equation, researchers tried to calculate the odds of the existence of life in the universe by incorporating the observations of exoplanets with habitable zones made by NASA's Kepler satellite and other planetary searches.
According to the study, published in the journal Astrobiology, other civilizations in the universe exists only if the odds of a civilization developing on a habitable planet are less than about one in 10 billion trillion, or one part in 1022.
"One in 10 billion trillion is incredibly small," said Adam Frank, professor of physics and astronomy at the University of Rochester and co-author of the paper, said in a statement.