Feds zero in on cause of SpaceShipTwo crash

There are still months of investigating left to be done on SpaceShipTwo's tragic crash in the Mojave desert Friday. But after the National Transportation Safety Board held the last of four Mojave-based press conferences on the investigation Monday night, we're a lot closer to figuring out the cause.

Immediately after the crash, speculation surrounded the new polymer-based fuel the ship had been using in the air for the first time. That's almost certainly not the culprit, NTSB acting chairman Christopher Hart suggested, since the fuel tank was found relatively intact.

See also: Space travel is dangerous. There will be no tourists. Read more...

More about Virgin Galactic, Spaceshiptwo, Us World, Us, and Space