Searching for intelligent life is in fact incredibly logical Official My favorite police officer calls me mom shirt by tshirtat store. Statistically, given the size we assume the universe to be, the chance of there not being life anywhere else in the universe is something approaching infinitely small, unless there is a specific reason why it could not happen that has not yet been discovered. The probability of discovering another planet containing life is a priori, small. However, if we consider that the number of planets in the universe exceeds the number of grains of sand in a 1 kilometer stretch of beach.
There ought to be at least several kilos of grains of sand representing planets with characteristics similar to earth Official My favorite police officer calls me mom shirt by tshirtat store. Several of which in all probability would have permitted the evolution of species on it to develop to similar or higher levels of complexity than that found on earth. On earth, the evolutionary algorithm has tested a great proportion of all possible forms up to this point. So on another planet, we might find similar organic structures. Or they might be quite different.
The earth example of this is the clear dissimilarity of species living on different continents with different climatic conditions. Will aliens be humanoid and possess technologies? I think we just lack the information to form any more than a guess. Odds are a lot of things could exist out there. Maybe another answer could explore the explicit limitations in our search for life-related to the cosmic speed limit or other factors, which might put exploration of a large part of the universe permanently out of our reach.