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Discovered, risk of Asteroid Hit the Earth

Written By Kepri Online on Friday, November 4, 2011 | 07:37

KOMPAS.com - NASA has identified a 90 percent risk of a giant asteroid hit the Earth, including an asteroid which is expected to lead to disasters like that caused the extinction of dinosaurs.

However, it turns out none of these asteroids threatening Earth in the next few centuries. "We now know where they are and where they go. This really reduces our risk for the hit," said Amy Mainser of NASA's Jet Propulsion Laboratory in Pasadena.

One of the largest giant asteroid has a diameter of 1,000 meters. The number of giant asteroids found there are 911 pieces of fruit that there are an estimated 981.

In addition to successfully identify 90 percent of a giant asteroid, NASA also found out that the asteroid-asteroid-sized amount to 44 percent less than expected. Scientists have discovered that could destroy the asteroid is a metropolitan city. However, fewer affirmed that does not mean there is no threat. "Fewer not mean nothing. There is still much to be discovered out there," said Mainser as quoted by AP.

Previously estimated there are about 30,000 medium-sized asteroids. However, recent calculations have only about 19,500 asteroids. The number of asteroids with a diameter of 100-1000 meters have been found at this time there are 5200 pieces.

The latest information on the number of asteroids is derived from spacecraft observations Wide-field Infrared Survey Explorer (WISE), launched in 2009. Spacecraft is tasked to find near-Earth objects, galaxies, stars and other cosmic objects targets. Unlike any other spacecraft, WISE can detect light and dark objects so that it can provide more accurate data.

WISE sampled asteroids of various sizes, and estimate the actual number of existing populations. WISE is not equipped with a sensing device the size of a mini asteroid millions of potentially hit the Earth.

Currently, WISE were in a state of "hibernation" or no activity detect any near-Earth objects. With the success of identifying asteroids, NASA managed to achieve the target set by Congress in 1998. Currently, NASA set a target to find 90 percent of existing asteroids measuring about 150 meters. It is said, the project was already running 35 percent.

Sources: AP
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