描述：火星-水之世界为自然科学类纪录片，National Geographic 频道 2008 年出品，是 NG Naked Science 系列其中之一 　　注: Discovery Channel 频道购买了本片的播映权, 影片出版者仍是 National Geographic 频道。 　　关键词：天文学 太阳系 火星 航天器 空间探测器 　　On May 25, 2008, NASA's Phoenix Lander will enter the Martian atmosphere and land on its polar ice-cap in the last phase of a historic mission to investigate Mars' past by digging down into the soil and ice - something that has never been done before. Scientists hope that the mission will reveal a great deal about Mars' geological history, but the biggest question they seek to answer: was Mars ever a watery world? And if so, could it have harboured primitive forms of life? This episode tells the story of this incredible NASA mission while investigating the Red Planet's warm, wet past.