US defence giant Lockheed Martin has struck a deal with an Australian technology firm to track "space junk" that can damage satelliteshttp://bbc.in/1vRPzNG
There are nearly 2,000 commercial and government satellites orbiting the Earth and they face up to 200 threats a day from debris. An object as small as a fingernail can travel at speeds of about 17,500 miles an hour.
Image: Nasa
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