A human return to the Moon will be a boon to science. On the Moon, we can l
earn about the geological processes that have shaped all of the terrestrial
planets by studying the well-preserved record of the Moon. The Moon is a s
uperb platform for the observation of the universe and sensitive instrument
s designed to take advantage of its unique environment will allow us to see
more of the universe more clearly. Both of these objectives require the gu
iding presence of human intelligence, flexibility, decision-making, and ada
ptation. Human field work is required to solve many scientific problems. Ex
perience has shown that human installation and maintenance of complex equip
ment in space is often required. No one has yet built a robot that duplicat
es or comes close to human judgement and flexibility. Beyond the sheer adve
nture of human spaceflight, people are needed to carry out the complex, sec
ond-generation scientific exploration of the planets.