by Planeta (Firm) · tapa blanda · ISBN 9788408010913
VAT included
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This road map of Extremadura offers essential tourist information and an exceptional level of detail. Published by Planeta in March 1994, this first edition of the guide provides travelers with a useful tool for exploring the region.
A planet is a large, rounded astronomical body that is generally required to be in orbit around a star, stellar remnant, or brown dwarf, and is not one itself. The Solar System has eight planets by the most restrictive definition of the term: the terrestrial planets Mercury, Venus, Earth, and Mars, and the giant planets Jupiter, Saturn, Uranus, and Neptune. The best available theory of planet formation is the nebular hypothesis, which posits that an interstellar cloud collapses out of a nebula to create a young protostar orbited by a protoplanetary disk. Planets grow in this disk by the gradual accumulation of material driven by gravity, a process called accretion.
