一颗喷气飞机大小的小行星下周五超低空掠过地球，比人造卫星还近

[reine02]

Jet-sized asteroid to pass between Earth and satellites
But no risk that it will hit us

CBC News

Posted: Feb 7, 2013 3:24 PM ET

[media]http://www.cbc.ca/news/interactives/asteroid/DA14_Asteroid.swf[/media]
A space rock about the size of a jet plane will zip so close to Earth that it will briefly come between us and our weather satellites next week.


小行星15日"造访"地球 比人造卫星还近

2013-02-02 03:59 新华网


美国航天局负责近地天体观测的科学家日前表示，一颗小行星将于今年2月15日在地球附近掠过，届时它与地球表面的最近距离不到2.77万公里。

据美国福克斯新闻网31日报道，这颗小行星名为2012DA14，宽度为50米。美国航天局喷气推进实验室近地天体项目高级研究员唐·约曼斯说，这颗很可能由石头组成的小行星“不大也不小”，它不会与地球相撞，但与地球的距离“会比很多人造卫星都近”。

目前，国际空间站和很多人造地球卫星都位于低地轨道，部分气象观测和通信卫星则位于地球同步轨道，小行星2012DA14与地球最近处将介于两种轨道之间。不过，约曼斯表示，这颗小行星撞击卫星的可能性“极小”。

据约曼斯介绍，平均每40年就有一颗小行星在地球附近掠过，而小行星撞击地球的概率约为每1200年一次。即便这颗小行星撞上地球，也不会造成灾难性后果。

 

[reine02]

An asteroid is going to hit the moon. But the event is not the benign impact predicted. The asteroid is heavier than scientist thought. The moon is knocked closer to Earth, the way "one marble hits another." The result is catastrophic: worldwide tsunamis are wiping out the coasts, earthquakes are rocking the continents, and volcanic ash is blocking out the sun...

"What happens on that fateful night is something no one expected. The meteor does, in fact, collide with the Moon. However, the impact was stronger than anyone had previously thought possible, and immediately, all throughout planet Earth, the effects of that collision begin to be felt. Tides, which are controlled by the Moon, become erratic, causing deadly tidal waves. Fissures in the Earth's crust crack, causing earthquakes worldwide, even in places where no earthquakes had ever occurred before. Within twenty-four hours, it becomes apparent that thousands upon thousands of people have died, and that, with the Moon out of its normal orbit, many more deaths are sure to follow."

"--the power outages, the food shortages, the weather changes, and the loss of human contact."

"The east coast has gone, earthquakes rip through the country, volcanoes erupt, the sun is obscured by ash and the world goes into permanent winter."

 

[Anakin]

谁给科普一下，飞机大小的也叫“行星”吗？

那得看是多大的飞机，安224一类的肯定算

 

[mooncake]

谁给科普一下，飞机大小的也叫“行星”吗？

行星是按轨道定义的，不是按大小来定义的。

 

[familyman]

人家英文里写的是asteroid

 

[bahaiwen]

人家英文里写的是asteroid

没错，小行星。

 

[familyman]

但是马上又写了 space rock.....

 

[reine02]

但是马上又写了 space rock.....

“Asteroid 2012 DA14”