NASA: Strong Evidence of Liquid Water on Mars
Scientists have found strong evidence of salt water on the planet Mars, the U.S. space agency NASA announced Monday.
NASA has found lines of "hydrated" salt minerals on Mars. Scientists say these minerals would require liquid water to be created. And where there's liquid water, they say, there could be life.
Jim Green is the director of planetary science at NASA Headquarters. He said during a news conference that "today, we are revolutionizing our understanding of this planet."
Doug McCuistion is the former head of NASA's Mars program. He told the Boston Herald that "if they are announcing that they have found easily accessible, freely flowing liquid water under the surface ... that has massive implications both for the potential for life on that planet and sustainability of humans."
NASA has found evidence of water on Mars in the past. In March, NASA said there was once more water on Mars than in Earth's Arctic Ocean. They say more than four billion years ago, Mars was covered with water 137 meters deep. But nearly all of it has since evaporated into space.
I'm Mario Ritter.
A transcript of the tapes was presented as evidence in court.
Plain water is fine for staying hydrated during the week.
One of the most remarkable features of the solar system is the variety of planetary atmospheres.
The sun evaporated some of the water, leaving land.
1.They say more than four billion years ago, Mars was covered with water 137 meters deep. But nearly all of it has since evaporated into space.
covered with 覆盖；布满
A large proportion of the earth's surface is covered with water.
The stair treads were covered with rubber to prevent slipping.
2.NASA has found evidence of water on Mars in the past. In March, NASA said there was once more water on Mars than in Earth's Arctic Ocean. They say more than four billion years ago, Mars was covered with water 137 meters deep. But nearly all of it has since evaporated into space.
once more 再次；再度
If only it were possible for me to see her once more!
Once more Athens flared into importance as the head of a confederation.
美国航空航天局在火星的条纹上发现了水合盐类矿物 。科学家表示，这些矿物质需要在液态水的作用下才能够形成 。而有液态水的地方就可能存在生命 。
吉姆·格林（Jim Green）是美国航空航天局行星科学部主任 。他在一次新闻发布会上称，“今天，我们对火星有了革命性的认识 。”
道格·麦克奎斯逊（Doug McCuistion）是美国航空航天局火星项目前任负责人 。在接受波士顿先驱报采访时他表示，“如果他们宣布在火星表面找到了可以轻易获取且自由流动的液态水，这对火星适合生命生存以及人类可持续发展的可能性有着巨大影响 。”
过去，美国航空航天局也曾找到过火星上存在水的证据 。美国航空航天局于今年三月份表示，火星曾经的蕴藏水量超过了地球的北冰洋 。他们还称，在40多亿年前，火星蕴藏的水量深达137米 。但是之后几乎所有的水都蒸发到太空中了 。