The Mars Pathfinder (landing in 1997) caught everyone's attention. Hubble photos have just captured the public imagination and had maybe more magazine covers than even John Glenn.

While it might not be everyone's favorite architecture, most people think it is achievable.

The past seven-plus years have seen just an incredible rejuvenation of energies at NASA leading to more missions within a shorter period of time.

Human space flight is not the only game in town at NASA.