|
我们发现的不是水，是水留下的痕迹。 Water trickles down gullies and crater walls on the surface of Mars, raising intriguing questions about whether life could exist on the red planet. 水流沿着火星表面的火山口壁和山壑流淌而留下的痕迹，又一次将“火星上是不是有生命存在”这一问题抛了出来。 The findings are the strongest evidence yet that liquid water darkens the Martian surface today; we've known for years that water flowed on Mars long ago. 如今，这一发现是证明液态水使火星表面变得暗沉的最有利证据。其实，多年前我们就知道，很久以前火星上是有水存在的。 Described Monday in Nature Geoscience, the observations suggest that this water appears seasonally, forming dark lines as it tumbles down steep Martian slopes. But scientists still don’t know where the water is coming from, or if the chemistry is even right for supporting life. 《自然地球科学》星期一发布的文章中称，这一发现表明这些水迹的出现是季节性的，水沿着陡峭的火星山壁一泻而下，形成了许多深色的水流线条。但是科学家还是不知道水源在哪，或这一化学物是否能够维持生命。 For now, the find solves the mystery of dark streaks that appear and disappear seasonally, called recurring slope lineae. 目前，这一发现解释了为什么火星表面总会季节性出现或消失深色线纹，这种线段的学名叫做“季节性斜坡纹线”。 | 
