extraterrestrial civilization cosmology 4 exobiology 2 philosophy and natural sciences 2 metaphysics 2 extraterrestrial signals 2 space-time 2 more ... artificial intelligence 2 science 2 science and religion 2 time 2 anthropogeny 1 biology 1 civilization 1 cosmology 1 facts and features 1 the philosophy of science 1 formal languages 1 history of civilizations 1 different life forms 1 natural sciences 1 social communication 1 artificial languages 1 universe 1 universe 1 všeobecnosti a zajímavosti 1 less ...