SpaceX Tests Huge Fuel Tank for Mars Colony Spaceship (Photo)

SpaceX has successfully tested a prototype of the gigantic fuel tank the company is developing for its planned Mars spaceship, company representatives said. SpaceX towed the full-size carbon-fiber tank — the largest such vessel ever produced, according to company founder and CEO Elon Musk — out to sea on a barge last week, then tested how the tank performed under pressure. "Hit both of our pressure targets — next up will be full cryo[genic] testing," SpaceX wrote via Twitter, w