Inner Workings: Early Mars may have boasted a large ocean and cool climate

摘要

When Mariner 4 buzzed Mars in 1965, it revealed a dry, desiccated world that stood in stark contrast to the habitable planet dreamed of by decades of science fiction writers. Subsequent observations revealed the apparent scars of rivers and deltas, and even potential sea shorelines. The revelations brought hope that the planet had once been wetter.