太空中,1年可能很长。2004年伊始,有关这颗红色行星曾被河流、湖泊及海洋所覆盖的概念还只是一种推测。现在,丰富确凿的证据已把推测变成了既定事实。1年前,谈论火星上现在可能存在生命还会被视为科学异端。但是,由于有证据表明,以前曾有过水,而且空气中不久前曾有过甲烷,使得火星存在生命的可能性成了值得认真讨 In space, one year may be very long. At the beginning of 2004, the concept of this red planet once covered by rivers, lakes and oceans was only a speculation. Now, abundant and conclusive evidence has turned speculation into established facts. One year ago, talking about the possible existence of life on Mars is still regarded as a scientific heresy. However, due to evidence that there had been water before, and there had been methane in the air not long ago, the possibility of life on Mars became worthy of serious discussion.