Despite the best efforts of astronomers, no one has yet succeeded in exchanging messages with intelligent life on other planets or in other solar systems. In fact, no one has even managed to prove that any kind of extraterrestrial life exists. Thus, there is clearly no intelligent life anywhere but on Earth. The argument's reasoning is flawed because the argument ['relies on a weak analogy rather than on evidence to draw a conclusion', 'confuses an absence of evidence for a hypothesis with the existence of evidence against the hypothesis', 'makes an inference that relies on the vagueness of the term "life"', 'fails to consider that there might be extraterrestrial forms of intelligence that are not living beings']