there are 10 raise to power 11 galaxies consisting of 10 raise to power 11 stars... so if around every star an earth like planet exists the probability goes to 10 raise to power 22
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100%. UFOs can be any unidentified flying objects. They don't necessarily have to be driven by aliens.
The probability is 0.The probability is 0.The probability is 0.The probability is 0.
The probability is 1.The probability is 1.The probability is 1.The probability is 1.
For any event A, Probability (not A) = 1 - Probability(A)
They are both measures of probability.