官方APP下载:英语全能特训(微信小程序版,支持苹果手机、安卓手机)
创办于2003年
UNSV记不住?那就记中文谐音“忧安思危”吧!
  Slow and Steady Wins the Race!
UNSV英语学习频道 - Slow and steady wins the race!
van allen站长就要结婚了!终身vip会员特惠活动进行中 >>>
手机微信学英语
打开手机微信,扫描以下二维码,即可通过我们的微信小程序学英语。
英语全能特训(微信小程序)
UNSV英语学习频道淘宝网店
淘宝网店购买咨询
客服短信:18913948480
客服邮箱:web@unsv.com
初级VIP会员
全站英语学习资料下载。
¥98元/12个月
终身VIP会员
一次购买,终身使用。
¥1990元/终身

Water Is Buried Beneath Mars' Surface, Study Says

阅读次数:

站长婚礼祝福VIP会员优惠活动正在进行中,点此立即优惠购买!
VIP会员专享下载:(非VIP会员无权下载!如果想下载,但还不是VIP会员,请点此订购
下载方式:使用鼠标右键(注意是鼠标右键!)点击下面的MP3音频/MP4视频链接,然后选择“另存为…”。
MP3节目录音 MP3节目录音 
文章原文
同步字幕

A huge lake of salty water appears to be buried deep in Mars, scientists reported this week. The presence of water raises the chances of finding life on the red planet.

The discovery is based on observations by a European spacecraft. It has excited experts. Water is necessary for life, and scientists have long hoped to prove that it is present on Mars.

Cassie Stuurman is a geophysicist at the University of Texas. In 2016, she found evidence of a huge ice deposit on Mars.

“If these researchers are right, this is the first time we’ve found evidence of a large water body on Mars,” Stuurman said.

Scott Hubbard, a professor of astronautics at Stanford University, is also excited about the discovery. He served as NASA’s first Mars program director in 2000. He said NASA has long believed in “following the water.” He is pleased that the new discovery supports that idea.

The study was published in the journal Science. Researchers are not yet sure how deep the area of water is. So, they cannot say whether it is an underground pool, an aquifer-like body, or just an area of soft, wet soil.

To find the water, Italian researchers examined radar signals. The signals were collected over three years by the European Space Agency’s Mars Express spacecraft. The results suggest that a 20-kilometer-wide water body lies below ice that is 1.5 kilometers thick. They believe the area is close to the planet’s southern pole.

Researchers spent at least two years examining the data to make sure they had found water – and not ice or another substance.

“I really have no other explanation,” said astrophysicist Roberto Orosei of Italy’s National Institute of Astrophysics in Bologna. He is lead writer of the study.

Mars is very cold, but salt in the water may have kept it from freezing. It is the same as when you put salt on a road to prevent ice from forming, said Kirsten Siebach. She is a planetary geologist at Rice University. She was not part of the study.

“This water would be extremely cold, right at the point where it’s about to freeze. And it would be salty.”

Siebach added that such conditions are not ideal for life to form. But, she said, there are bacteria on Earth that have been able to survive in similar conditions.

Roberto Orosei said it is easy to think that the water body is the first place where life could exist on Mars. But he believes the planet may have other hidden bodies of water, waiting to be discovered.

Mars has been a popular planet for exploration, with some groups placing instruments on its surface and others examining it from space. In May, NASA launched another spacecraft, the InSight Mars lander. It will dig under the surface after it reaches a flat area of the planet in November.

I’m Lucija Millonig.

Emilio Rodriguez Mega reported this story for the Associated Press. Alice Bryant adapted it for Learning Engish. Ashley Thompson was the editor.

Words in This Story

spacecraftn. a vehicle that is used for travel in outer space

geophysicistn. a scientist whose study deals with the physical movements and forces of the Earth

depositn. an amount of something (such as sand, snow, or mud) that has formed or been left on a surface or area over a period of time

astronauticsn. the science and technology of human space travel and exploration

pooln. a small area of water

aquifern. a layer of rock or sand that can absorb and hold water

polen. either end of the imaginary line around which something, such as a planet, turns

geologistn. a scientist who studies rocks, layers of soil, et cetera, in order to learn about the history of the Earth and its life

idealadj. exactly right for a particular purpose, situation, or person

网友的学习评论(0条):
版权所有©2003-2019 南京通享科技有限公司,保留所有权利。未经书面许可,严禁转载本站内容,违者追究法律责任。 互联网经营ICP证:苏B2-20120186
网站备案:苏ICP备05000269号-1中国工业和信息化部网站备案查询
广播台