One Russian and One U.S. satellite collide at 500 miles per second . Collision is believed to be the second of its kind . Dickey spokesman quoted as saying crash produced massive debris cloud . Major Regina Winchester , of the U.S. Strategic Command , said : `` Space is getting pretty crowded . Wreckage from collision expected to burn up in the Siberia 's atmosphere .
One Russian and One U.S. satellite collide at 500 miles per second . Collision is believed to be the second of its kind . Dickey spokesman quoted as saying crash produced massive debris cloud . Wreckage from collision expected to burn up in the Siberia 's atmosphere .