By Lucy-Ann McFadden, Paul Weissman, Torrence Johnson

ISBN-10: 0120885891

ISBN-13: 9780120885893

Иллюстрированная энциклопедия Солнечной системы.
Огромное количество разнообразных иллюстраций и фото планет и астеройдов, сделанных с Земли и с космических аппаратов.

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The composition of the IDPs reflects the range of source bodies that produce them and include ordinary and carbonaceous chondritic material and suspected cometary par- ticles. Because the degree of heating during atmospheric deceleration is a function of the encounter velocity, recovered IDPs are strongly biased toward asteroidal particles from the main belt, which approach the Earth in lower eccentricity orbits. Nevertheless, suspected cometary particles are included in the IDPs. The cometary IDPs show a random, “botryoidal” (cluster-of-grapes) arrangement of submicron silicate grains similar in size to interstellar dust grains, intimately mixed in a carbonaceous matrix.

Among the terrestrial planets, the only known satellites are the Earth’s Moon and the two small moons of Mars, Phobos and Deimos. The Earth’s Moon is unusual in that it is so large relative to its primary. The Moon has a silicate composition similar to the Earth’s mantle and a very small iron core. It is now widely believed that the Moon formed as a result of a collision between the proto-Earth and another protoplanet about the size of Mars, late in the accretion of the terrestrial planets. Such “giant impacts” are now recognized as being capable of explaining many of the features of the solar system, such as the unusually high density of Mercury and the large obliquities of several of the planetary rotation axes.

Saturn’s satellite system is very different from Jupiter’s in that it contains only one large satellite, Titan, comparable in size to the Galilean satellites, 8 intermediate-sized satellites, and 47 smaller satellites. Titan is the only satellite in the solar system with a substantial atmosphere. Clouds of organic residue in its atmosphere prevent easy viewing of the surface of that moon, though the Cassini spacecraft has had success in viewing the surface at infrared and radar wavelengths. The atmosphere is primarily nitrogen and also contains methane and possibly argon.

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Encyclopedia of the Solar System / Энциклопедия Солнечной Системы by Lucy-Ann McFadden, Paul Weissman, Torrence Johnson


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