Download Intelligent Life in the Universe: Principles and by Alexander G. Volkov PDF

By Alexander G. Volkov

This e-book addresses all technology readers drawn to the origins, improvement, and destiny of clever species within the observable a part of our universe. specifically, the writer scrutinizes what sort of information regarding extraterrestrial clever existence could be inferred from our personal organic, cultural and clinical evolution. the 1st a part of the ebook presents the required historical past details from house and lifestyles sciences, hence making the e-book available to scholars and normal technology readers.

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8 ME ) have also been found. However, as pulsars are the neutron star remnants of a recent supernova explosion, these planets must have newly formed and are not likely to be seats of life. 2 Direct Search Methods for Planets How does one find planets? The direct method of detecting planets is potentially the most powerful and will probably be the most productive in the more distant future. With the direct method the reflected starlight or the infrared radiation from a planet is observed. Presently, the problem with this method is that at the great stellar distances the angle between the planet and the star is so small that the weak emission from the planet is lost in the blinding glare of the parent star.

These distance ranges for stars of different masses and spectral types are shown in Fig. 4. Terrestrial planets lie between the two dashed lines. The left line is the inner boundary for the formation of planets in a solar system, while the right line is the ice−formation boundary, which marks the beginning of the region where jovian planets form (Chap. 2). There is no well defined boundary between jovian planets and Kuiper belt objects further out. Note that the planets of the solar system (except Pluto) are indicated by dots.

Habitable regions (light gray) if Earth were at various distances from the Sun. Arctic regions are shown in white and desert regions in dark gray pletely frozen world (Fig. 3). These two types of fate were essentially what happened to Venus and Mars. 2 Habitable Zones Around Other Stars Now consider the habitable zones around other stars. Stars differ in size (there are giant and dwarf stars) and in surface temperature. Since the overwhelming majority of stars are dwarfs, or more precisely main sequence stars (see Chap.

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