sentence: The failure occurred when Orbital Sciences Corporation 's Antares rocket , which was carrying the Cygnus vehicle with cargo of 5,000 pounds ( about 2,300 kg ) , exploded after liftoff at 6:22 p.m. local time ( 2222 UTC ) , creating a massive fireball in the sky .
question: how did something fail _ _ _ ?
answers: creating a massive fireball in the sky exploded after liftoff