After nearly 9 months of investigation, the National Transportation Safety Board has an official explanation for Virgin Galactic's SpaceShipTwo crash. The accident happened when the co-pilot triggered the "feathering" system (moving the tail wings to increase drag) well below the intended Mach 1.4 speed.
The premature resistance led to the suborbital craft breaking up and plummeting into the Mojave Desert. More details are forthcoming, but Virgin Galactic says that it welcomes the findings. Hopefully, the lessons learned prevent future accidents and keep private spaceflight on track.