SpaceX rocket explodes after landing

The unmanned mission, powered by a SpaceX rocket, accomplished its primary goal of carrying a satellite into low orbit. But its secondary goal -- to land the rocket upright on a floating platform called a droneship -- ended in a fiery explosion.

SpaceX CEO Elon Musk posted a video of the botched landing on Instagram, showing the rocket setting down softly but then toppling over and exploding on impact.

"Falcon lands on droneship, but the lockout collet doesn't latch on one the four legs, causing it to tip over post landing. Root cause may have been ice buildup due to condensation from heavy fog at liftoff."