摘要: Over the past 30 years, water-generated landforms and landscapes of Mars have been revealed in increasing detail by a succession spacecraft missions. Recent data from Global Surveyor mission confirm view that brief episodes water-related activity, including glaciation, punctuated geological history Mars. The most recent these seems to occurred within 10 million years. These new results are anomalous regard prevailing martian surface has continuously extremely cold dry, much as it is today, for 3.9 billion Interpretations controversial, but explaining anomalies consistent manner leads potentially fruitful hypotheses understanding evolution relation Earth.