New Frontiers in Solar System Exploration

摘要

ver the last four decades, robotic spacecraft have visited nearly every planet, from torrid Mercury to frigid Neptune. The data returned by these Pioneers, Mariners, Vikings, and Voyagers have revolutionized our understanding of the solar system. These achievements rank among the greatest accomplishments of the 20th century. Now, at the opening of the 21st, it is appropriate to ask, where do we go from here?