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Near-Earth Objects are comets and asteroids that have been pushed by the gravitational attraction of nearby planets into orbits that allow them to enter the Earths neighborhood They are about 45 billion years and can range in size from pebbles or lumps of ice to rocky or icy worlds nearly 1000 kilometers across An asteroid or comet may become a Near Earth Object when its trajectory intersects the orbit of the Earth or is within 03 Astronomical Units distance between the earth and the sun A Comet is a body revolving around the sun A comet is characterized by a long luminous tail but only in the segment of the comets orbit when it passes closest to the sun Composed mostly of water ice with rooted dust particles comets originally formed in the cold outer planetary system while most of the rocky asteroids formed in the warmer inner solar system A Meteor is a small solid body that enters a planets atmosphere from outer space and raised to combustion by the friction resulting from its fast motion An Asteroid is one of the many small or minor planets that are members of the solar system and that move in elliptical orbits primarily between the orbits of Mars and Jupiter Some 65 million years ago dinosaurs and 75 percent of those species then on Earth seem to have been executed to extinction by the impact of a 10-kilometer-diameter 6-mile NEO The Tunguska event of 1908 in Siberia warns the United States Air Force on small objects entering Earths atmosphere and particularly the impact of some two dozen fragments of comet Shoemaker-Levy 9 with Jupiter in 1994 all underscore that dangerous impacts may occur today The best estimate of the probability of a civilization-threatening collision in the next century is nearly one in 1000 Estimates of the numbers of Near Earth Objects of different sizes can be made either by direct measurement using ground-based telescopes or inferred
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