What is the probabilty that there are aliens?

Answer 1

At the moment, there are too many variables, with too wide a margin of error to make a truly reasonable estimate. Too many factors (such as the number of planets and stars, number of planets able to support life, their vicinity to stars etc) are unknown, however a scientist has developed a formula to calculate the probability of life on other planets once these other factors have been satisfactorily settled.

That and the fact that life here on earth happened , due to a long line of specific circumstances, and accidents, this makes the chances smaller than the present theories floating around.

Answer 2

Where I live, I am an alien: I was born in a different country than the one I live in.

Seriously, it is sort of ... risky to calculate the probability of something unconfirmed like this. My personal opinion is that if life developed on Earth (assuming it did! - see also the Panspermia hypothesis), it has very likely also developed in other places, given the immensity of space, and the number of stars and planets.

Answer 3

Given the current lack of verifiable evidence, the probability of aliens existing is unknown. Some scientists speculate that the vastness of the universe makes it statistically likely for extraterrestrial life to exist, but until conclusive evidence is found, the probability remains uncertain.