The Defenders of the Planet NASA works on the planet earth as they plan to establish earth Planetary defense Using asteroids detector, NASA has established the Planetary Defense Coordination Office, which will be in charge of efforts to detect asteroids that might hit Earth.
NASA has established the Planetary Defense Coordination Office, which will be in charge of efforts to detect asteroids that might hit Earth and will work with other government agencies, such as the Federal Emergency Management Agency (FEMA) and the Department of Defense, to coordinate the response to any possible asteroid impact.
The type of dangerous asteroids the Office will monitor are called near-Earth objects (NEOs). More than 13,500 NEOs are known, and nearly all were discovered in NASA surveys with both ground- and space-based telescopes. A goal of the office will be to discover 90 percent of NEOs larger than 140 meters (450 feet) by 2020. Only one-fourth of these “city-killer” asteroids have been discovered.
This graph shows the estimated average time between impacts of near-Earth objects over a range of sizes and equivalent amounts of released kinetic energy upon impact.
Because there are far fewer large NEOs than smaller ones, the chance of an impact drops off rapidly with increasing size. Objects of the size thought to have resulted in the explosion over the Tunguska region of Siberia in 1908 and in the Chicxulub crater off Mexico’s Yucatán Peninsula 65 million years ago are located on the curve for reference.
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