By Timothy Kusky
Asteroids and comets are house gadgets that orbit the solar. This ebook examines the numerous craters on the earth that experience shaped because of meteorites or asteroids crashing into the planet, excavating large holes and wreaking common destruction at the panorama.
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Additional info for Asteroids and Meteorites: Catastrophic Collisions With Earth (The Hazardous Earth)
Just as the resonances represent stable places for asteroids to orbit, the gravitational forces of large planets such as Jupiter cause some places to be particularly unstable for asteroids. These places are devoid of asteroids, and are known as Kirkwood gaps (after their discoverer, Daniel Kirkwood (1814–95), who first described them in 1886). Gravitational physics results in some additional locations that represent stable orbits for asteroids in the inner solar system. These stable orbits were first described by the French mathematician Joseph-Louis Lagrange (1736–1813) in the late 18th century.
They may get pushed into Earth-crossing orbits after being deflected by collisions in the asteroid belt or by gravitational perturbations during complex orbital dynamics. Spectral measurements of some of the asteroids show that they have compositions that correlate with the meteorites sampled on Earth, and a crude gradation of compositions in the asteroid belt is thought to represent both the original distribution of different parent bodies that broke up during collisions, and the initial compositional trends across the solar nebula.
Indd 32 10/20/08 5:21:20 PM orbits and Compositional Classification of meteorites 33 the Stardust Comet Sample Return Mission, which flew through the tail of comet Wild 2 and collected samples of the tail in a silica gel, and returned them to Earth in 2006. Scientists were expecting to find many particles of interstellar dust, or the extrasolar material that the solar nebula was made of, but instead found little of this material, and predominantly silicate mineral grains of Earthlike solar system composition.
Asteroids and Meteorites: Catastrophic Collisions With Earth (The Hazardous Earth) by Timothy Kusky