Washington of Xinhua News Agency on May 18 report (reporter Ren Haijun) American spaceflight bureau expressed a few days ago, the scientist is based on " extensive role is infra-red measure detector " observation result is conjectural, earthly periphery may distributing to make an appointment with 4700 potential and dangerous asteroid, their d mountain t shirts iameter is in 100 meters of above, and there is 20% only in this kind of asteroid arrive 30% already was explored.
In the definition of American spaceflight bureau, potential and dangerous asteroid is the place that shows moving orbit and earthly course are the nearest the asteroid in less than of 8 million kilometer, because their volu plantronic wireless headsetme is enough big, won't danger in the calcination when passing earthly aerosphere, can cause local or big range free loony tunes golden to destroy to the earth consequently.
Introduce according to spaceflight bureau, the scientist uses detector to be opposite among them 107 potential and dangerous asteroid undertake sampling investigating, the potential and dangerous minor planet that pushs periphery of cipher out earth to may distributing thereby makes an appointment with 4700, losing an error to make an appointment with 1500. The scientist before this and thi free plantronic wireless headset s the estimation result photograph with respect to this kind of asteroid is similar. Relevant research paper also will be published in American new first phase " astrophysical magazine " on.
Because plan Er says,astronomer of jet propulsion lab strides American spaceflight bureau, double what before the amount of potential and dangerous asteroid that goes up at low obliquitous orbit among them achieves this almost, estimate. This kind of asteroid is bigger to dangerous sex of the earth, but arrive more easily as a result of spacecraft, they also offerred observation asteroid for the scientist more the main chance. According to the instruction of American president Aobama, american spaceflight bureau is centering energy to make big thrust rocket at present, strive sends astronaut toward minor planet, head for spark finally.
Because plan Er says,stride, people need not feel panicky to this kind of asteroid, spaceflight bureau will pay close attention to this one problem closely.
"Extensive role is infra-red measure detector " entered the space on December 14, 2009, its are main the task is to scan whole sky, search for the mankind's sealed asteroid and comet to wait, undertake classify to them, list the likelihood makes minatory celestial body to the earth thereby. Introduce according to American spaceflight bureau, because deploy,have infra-red detector, "Extensive role is infra-red measure detector " can explore darkness and light celestial body. (Be over)
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