官方APP下载:英语学习播客(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!
公众微信服务号(英语全能特训)
英语全能特训(微信公众服务号)
UNSV英语学习频道淘宝网店
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

Water on Mars: What Does It Mean?

作者:Anne Ball 发布日期:11-9-2015

Water on Mars: What Does It Mean?
Water on Mars: What Does It Mean?

For centuries, humans have wondered whether there is life on Mars.

Scientists have asked why Mars is losing its atmosphere. Last week, the question was answered with a song.

"The answer, is blowing in the wind," said Michael Meyer, taking a line from a Bob Dylan song. Meyer is the lead scientist for NASA's Mars Exploration Program.

It turns out solar winds from the sun are slowly stripping away Mars' atmosphere. That is what NASA scientists explained at a press conference Thursday.

Bruce Jakosky is principal investigator on the MAVEN team. MAVEN stands for Mars Atmosphere and Volatile Evolution. It is a spacecraft that collects information from Mars as it circles the planet.

Today, Mars has a thin atmosphere. It is cold and dry, with a desert-like environment. Jakosky says it used to be much different.

"When we look at ancient Mars, we see a different type of surface. One that had valleys that looked like they were carved by water, lakes that were standing for a long periods of time. We see an environment that was much more able to support liquid water."

NASA scientists have used the phrase "follow the water" in their work to understand Mars.

Recently they found a kind of liquid water that flows with salt down a mountain area of the planet. But, it is not always there.

Scientist Michael Meyer describes what they found:

"We're seeing water, with the salt that's able to flow down the sides of the cliff. Why is this important? That means there is water on Mars, on the surface of Mars today."

Scientists already knew that ice exists at the polar caps of Mars. So why is it important to find liquid water? Meyer explains:

"It means that we have a resource. And when we're looking at sending humans to Mars, water is one of the key things that we need to have. Not only for the astronauts to drink, but also to make oxygen, to make fuel, and so having a ready resource there on the planet make a big difference in terms of how much stuff you have to bring with you."

Sending humans to Mars is still in the distant future. NASA is aiming for the 2030s. The space agency has even started a recruiting campaign to hire new astronauts. Those chosen might fly any number of space vehicles still in development.

Both U.S. government and private industries are developing rockets and spacecraft to get people to Mars.

Many questions need to be answered: How do you protect humans from radiation in space? How do you grow food in space ships on the way to Mars? How do they grow food once they arrive on Mars? Having access to water on the planet will be critical to that effort.

Meanwhile, American astronaut Scott Kelly just passed a halfway mark. Kelly, and Russian Mikhail Kornienko, are spending a year on the International Space Station circling the Earth. Scientists want to know how the human body reacts to being in space for long periods of time.

Whether there is life on Mars remains unanswered. But some scientists say they think there might be some kind of microbial life on the planet.

Michael Meyer is more cautious, saying it has yet to be proven. He says there could be life there today, if it ever got started there in the first place. Finding life, however small, on another planet in our solar system would be so exciting:

"Whether or not there's life on Mars doesn't matter, whether or not I think so, or don't think so. I'm a scientist, I want to go and find out. The real point is we don't know, but it's a good question. It's a reasonable question. It's something we should be pursuing. 'Cause imagine how exciting that would be to find evidence of life somewhere else, not on our planet."

And that, finding life on another planet, would certainly change the way we view the whole universe.

I'm Anne Ball.

Anne Ball reported this story. Kathleen Struck was the editor.

Words in This Story

strip (ping) - v. to remove matter from something

distant - adj. far away

microbial - adj. extremely small living thing

cautious - adj. careful

solar system - n. our sun and the planets that move around it

What do you think? Would you want to go to Mars? We want to hear from you. Write to us in the Comments Section.

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:苏公网安备 32010202011039号苏ICP备05000269号-1中国工业和信息化部网站备案查询
广播台