Op-ed | Moon Direct: How to build a moonbase in four yearsby Robert Zubrin — March 30, 2018SpaceX’s Falcon Heavy rocket, which made its debut Feb. 6, is the foundation of author Robert Zubrin’s “Moon Direct” plan for affordably returning humans to the moon within four years. Credit: SpaceX This op-ed originally appeared in the March 26, 2018 issue of SpaceNews magazine.The recent amazing success of the Falcon Heavy launch offers America an unprecedented opportunity to break the stagnation that has afflicted its human spaceflight program for decades. In short, the moon is now within reach.Here’s how the mission plan...