Conditions for Life We already know that we are not able to define life, and our limited knowledge of life is based on the only reference system available, planet Earth. The discovery of extremophiles, microorganisms that can develop in extreme conditions, has expanded the window of possibilities for the existence of life in the universe. But what can we say about the conditions required for life? In a classical paper presented by G. Wald in 1964 to the US National Academy of Sciences, it was established that life requires: the presence of liquid water; the elements needed for metabolism and reproduction; a source of energy; and suitable environmental conditions. Of these conditions the most important is the existence of water in liquid state. All the current space missions designed for the search of life in the universe have a common obsessive instruction: look for water. However, other conditions also play a decisive role. Without certain other elements, a sufficient source of energy and stable and protective surroundings, it is difficult to imagine that life can survive. Many research disciplines meet It is obvious that a great many things have to be considered when conditions for life are discussed. This is the reason why the science that deals with these matters, astrobiology, has to be inter- and intradisciplinary to accomplish its goal. Astrobiology is a true meeting place of scientists with many different backgrounds and interests. Together they try to understand which conditions must be fulfilled for the emergence and survival of life in the predominently hostile surroundings of our universe. One thing we know, though - life has survived for several billion years on the Earth. Obvously the conditions have been right here. Perhaps life can only thrive on planets like the Earth? That makes the current search for exoplanets even more important. Or could life, once it exists, perhaps manage to survive in other places and environments in the universe?