A Close Shave; Dealing with Asteroid Strikes  

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Jenis: Article from Bulletin/Magazine
Dalam koleksi: The Economist (http://search.proquest.com/) vol. 406 no. 8824 (Feb. 2013), page 74.
Topik: International; Meteors & Meteorites; Asteroids; Research & Development--R&D; Safety Management

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Perpustakaan Pusat (Semanggi) Nomor Panggil: EE29.75 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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One close shave with an asteroid is cause for excitement. Two on the same day is scary. On February 15th planet Earth experienced exactly that, as a hunk of itinerant space rock passed by extremely close, while another exploded spectacularly in the skies above Russia. The first asteroid, called 2012 DA14, had been known to astronomers for around a year. They had calculated that there was no risk of collision. But the 30-metre, 190,000-tonne rock came close: 27,700km (17,200 miles) above the surface, inside the orbit of some satellites. It was the nearest ever recorded for an asteroid that size. The second came quite literally out of a clear blue sky, appearing without warning and then disintegrating about 30 seconds later over Chelyabinsk. This double whammy has focused minds on the threat from asteroids, something that astronomers have long known is real but which tends to be treated with giggles whenever it is brought up outside the lab.

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