Mars: We’re back. When NASA scientist Stephen Saunders uttered these three words Wednesday, less than 24 hours after the Mars Odyssey spacecraft had become the Red Planet’s newest satellite, there were no lines to read between. The meaning was clear: NASA is back on track. The words also implied that the space agency’s troubled Jet Propulsion Laboratory is on the road to recovery. And “faster, better, cheaper,” the decade-old mantra that has driven many of NASA’s recent successes — as well as forced some dismal failures — does work. But what does the success mean for the future of the Mars program, or for the possibility of putting people on Mars?