Intelligent Life in the Universe: Principles and by P. Ulmschneider

By P. Ulmschneider

This booklet addresses all technological know-how readers attracted to the origins, improvement, and destiny of clever species within the observable a part of our universe. particularly, the writer scrutinizes what sort of information regarding extraterrestrial clever existence will be inferred from our personal organic, cultural and clinical evolution. the 1st a part of the publication presents the mandatory history details from area and existence sciences, therefore making the booklet obtainable to scholars and normal technological know-how readers.

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Additional info for Intelligent Life in the Universe: Principles and Requirements Behind Its Emergence (Advances in Astrobiology and Biogeophysics)

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Astrobiol. , pp. com/ 52 4 Planets Suitable for Life In order to ensure the basic functions of life, even the most simple living organisms are made up of a large number of different building blocks of intricately designed form and complicated function. Only organic compounds have the huge variety, the different shapes and functions, required of such construction materials of life. It is thus no surprise that life on Earth is based on organic chemistry. Certainly, life could be imagined based on other types of chemistry; for instance, on silicon (see Chap.

2), the excess infrared emissions indicate the presence of newly formed dust, generated by collisions of asteroids and by evaporation from comets. The IRAS satellite discovered that 15% of A, F, G, and K main sequence stars have significantly (100 times) higher infrared excess emission than the Sun, which must be attributed to such debris disks. While these disks do not form planets, their presence nevertheless proves that planet-type bodies (asteroids and comets) had been produced during 46 3 The Search for Extrasolar Planets the original star formation process, which strengthens the theoretical picture that planetary systems are the natural byproduct of star formation.

G. Kitamura et al. 1997), the accretion slows, the jets decline, and the stellar wind becomes more important. At this point the outflow region widens (Fig. 6b), as the accretion disk has essentially collected all of the matter from the original cloud fragment. Deprived of further mass infall, and depleted from continued planetesimal growth, the disk becomes thin. Eventually, the energetic stellar wind sweeps the remaining gas and dust out of the system, leaving only the planetesimals, planets, and Kuiper belt objects behind (Fig.

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