By Erik Gregersen
The sun's warmthwhile loved via the interior planetsloses its power within the outer sunlight approach, as does our wisdom. The mysterious Jovian planets and dwarf planets, ultra-red subject, and short-period comets will fascinate readers forever. As NASAs New Horizon venture will let us know extra approximately Pluto and the Kuiper Belt in 2015, this ebook lays the basis in anticipation of our forthcoming new truths. The narrative is supported through attractive photos and interesting sidebars.
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Additional info for The Outer Solar System: Jupiter, Saturn, Uranus, Neptune, and the Dwarf Planets (An Explorer's Guide to the Universe)
Radio-ranging measurements that were transmitted from the surface of Mars between 1976 and 1980 by the two Viking landers and time-delay radar observations using the Mars Pathfinder lander made it possible to determine distances to Mars with an accuracy of about 10 metres (32 feet). The three largest asteroids—Ceres, Vesta, and Pallas—were found to cause departures of Mars from its predicted orbit in excess of 50 metres (164 feet) over times of 10 years or less. The measured departures, in turn, were used to estimate the masses of the three asteroids.
54 AU. Measuring Asteroids The first measurements of the sizes of individual asteroids were made in the last years of the 19th century. A filar micrometer, an instrument normally used in conjunction with a telescope for visual measurement of the separations of double stars, was employed to estimate the diameters of the first four known asteroids. The results established that Ceres was the largest asteroid, having a diameter estimated to be nearly 800 km (497 miles). These values had remained the best available until new techniques for finding albedos (reflectivities) and diameters, based on infrared radiometry and polarization measurements, were introduced beginning about 1970.
004 inch) in diameter, are generally collected on filters attached to aircraft flying in the stratosphere at altitudes of at least 20 km (12 miles), where the concentration of terrestrial dust is low. On Earth’s surface, somewhat larger micrometeorites have been collected from locations where other sources of dust are few and weathering rates are slow. These include sediments cored from the deep ocean, melt pools in the Greenland ice cap, and Antarctic ice that has been melted and filtered in large amounts.