A Russian Proton rocket failed to burn its upper stage engine for as long as planned during a launch from Kazakhstan Feb. 28, leaving the Arabsat 4A satellite stranded in a low orbit, International ...

Any launch vehicle that flies as often as Russia's Proton is bound to have its share of mishaps. The venerable heavy-lifter has flown 388 missions since its first in 1965, 45 of which have been deemed ...