SpaceX said it has pitched NASA a "simplified mission" to put astronauts back on the moon following criticisms over delays by Sean Duffy, the space agency's acting administrator. In a company blog post out Thursday, Elon Musk's aerospace and defense contractor said: "We've shared and are formally assessing a simplified mission architecture and concept of operations that we believe will result in a faster return to the Moon while simultaneously improving crew safety." Earlier this month, Duffy