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As a rule, the most common types of stony asteroids would not be expected to cause ground damage unless their diameters were about 25 meters in diameter or larger. A more extensive ... A short report on Near-Earth Object (NEO) hazard mitigation strategies was developed in response to a request for information by the U.S.
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Near-Earth Objects (NEOs) are comets and asteroids that have been nudged by the gravitational attraction of nearby planets into orbits that allow them to enter the Earth's neighborhood.
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Near-Earth object - Wikipedia, the free encyclopedia
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A near-Earth object ( NEO ) is a Solar System object whose orbit brings it into close proximity with the Earth. All NEOs have a perihelion distance < 1.3 AU. They include a few thousand near-Earth...
en.wikipedia.org/wiki/Near-Earth_object
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more fireball images: from KSL TV in Utah; from KTVB News in Idaho; from Thomas Ashcraft near Santa Fe, New Mexico; ... Potentially Hazardous Asteroids (PHAs) are space rocks larger than approximately 100m that can come closer to Earth than 0.05 AU. None of the known PHAs is on a collision course with our planet,
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NASA Science News: radar maps of Near Earth Objects are providing new insights into the structure and composition of comets and asteroids. ... August 7, 1998: Yesterday NASA announced the discovery of two new Near Earth Asteroids. They were found in observations made with JPL's Near-Earth Asteroid Tracking (NEAT) system.
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science.nasa.gov/newhome/headlines/ast07aug98_1.htm
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Rocky relics: getting the lowdown on near-Earth asteroids. (includes related article on asteroids larger than 1 kilometer, which cross Earth orbit) ... find Science News articles. Earth shares the inner solar system with a swarm of objects--some of which pass closer to us than the moon. ... A few thousand more of these NEAs-
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www.highbeam.com/doc/1G1-14818138.html?refid=ip_hf
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§ 1.1 Overview -- utilization of asteroids near Earth ... § 1 Asteroids Near Earth -- Materials for Utilization ... Forward to Asteroids Near Earth - Overview...
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www.permanent.com/a-index.htm
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Experts have catalogued about 9,100 near-Earth asteroids floating around out there, but officials figure that 95,000 space rocks at least 140 metres in diameter - all larger than the one that hit Tunguska - are still in orbit.
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www.theglobeandmail.com/servlet/story/RTGAM.20080627.ws...
www.theglobeandmail.com/servlet/story/RTGAM.20080627.wsatellite27/BNStory/Science/home
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Recent downward revisions to the estimated number of large near-Earth asteroids will not make much difference to the required survey effort.
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www.space.com/news/japan_spacewatch_000426.html
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