At the moment, about 9, 000 NEAs are known, most of them courtesy of ground-based programmes looking for bodies that might one day hit Earth.

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Russia kept the tie in Wiener Neustadt alive courtesy of a five-set victory 7-6 (7-1) 6-7 (7-9) 7-5 3-6 4-6 by Nikolay Davydenko and Mikhail Youzhny over Alexander Peya and Olivier Marach to leave Austria 2-1 up with just Sunday's singles to play.

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