Spirit has climbed to the hilltop and looked over the other side, but NASA did not do this just to say we can do it. The Mars rovers are addressing fundamental questions about Martian history and planetary environments." ()
Spirit and Opportunity are approaching targets that a year ago seemed well out of reach. Their successes strengthen NASA's commitment to a vision with the ambitious targets of returning samples from Mars and sending human explorers to Mars.
Mars doesn't treat you very well, for the most part. So this is a very challenging thing to do." ()
It's going to be difficult to get it into orbit. Mars is hard, Mars can be unpredictable, but we've got a good team here." ()
The first boots on Mars will probably get dusty at one of the many potential landing sites the Mars Reconnaissance Orbiter will inspect all over the planet." ()