Titlebook: Intelligent Life in the Universe; Principles and Requi Peter Ulmschneider Book 20031st edition Springer-Verlag Berlin Heidelberg 2003 astro

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Planet Formation consequence of stellar evolution, the present cosmic abundances of chemical elements came about. Planets do not form independently; rather, their generation is an inevitable byproduct of star formation. This is because the gravitational collapse of large amounts of gas and dust from the interstella

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Life and its Origin on Earthto answer this question. The first is to set up detailed search programs for extraterrestrial life, both inside and outside the solar system. Although unsuccessful so far, this procedure, as will be seen in Chap. 7, is potentially very powerful and has a high chance of detecting extraterrestrial lif

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Evolutionet, will it also develop toward intelligence? As this is hotly debated, we will now describe the development of life on Earth in more detail in order to show that there are good reasons why evolution should culminate in intelligent beings.

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The Search for Extraterrestrial Lifehere (see Chaps. 5 and 6). A more direct approach is to search for favorable conditions and traces of life on other celestial bodies, both in the solar system and beyond. Clearly, there is little chance of encountering nonhuman intelligent beings in the solar system. But there could well be primitiv

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Extraterrestrial Intelligent Lifeintelligent life. Although no trace of such life has so far been found, there are clearly compelling reasons for its existence. In Chap. 4 we estimated that Earth-like planets should occur quite frequently in our galaxy, and in Chaps. 5 and 6 it was shown how life, and intelligent life, have formed