NASA generally proceeds slowly and incrementally – especially when human beings are blasted into space. But President Donald Trump and his advisers want to do something bold with the space program, and they’ve asked NASA to consider speeding up a long-planned moon mission. So NASA has launched a feasibility study to see what the risks and benefits would be if the agency added two astronauts to the first test flight of a new rocket and capsule. That flight, Exploration Mission 1, or EM-1, is scheduled for November 2018. The new Space Launch System rocket would blast off with a new...