One Russian and one U.S. spacecraft collide at 10 km per second . `` Any time there 's an event that creates more debris , it 's a concern , '' she said . Collision is believed to be the first of its kind . NASA spokesman quoted as saying collision creates massive debris cloud . Wreckage from collision continues to burn up in the Earth 's atmosphere .
One Russian and one U.S. spacecraft collide at 10 km per second . Collision is believed to be the first of its kind . NASA spokesman quoted as saying collision creates massive debris cloud . Wreckage from collision continues to burn up in the Earth 's atmosphere .