SpaceX promised something big, and it's now delivered. The company today revealed its plans for the Falcon Heavy, which promises to be the "world's most powerful rocket." Just how powerful is that? SpaceX says the 22-story rocket will be able to carry satellites or spacecraft weighing over 53 metric tons (or 117,000 pounds) into low earth orbit, which is nearly twice what the Space Shuttle is able to carry. What's more, this isn't just a far off promise. SpaceX says the rocket will be "ready" sometime next year, and the first test flight is planned for 2013. The rocket's sheer size isn't it's only selling point,
