Because Mars doesn't have waterToday, Mars has a thin atmosphere. It is cold and dry, with ato keep the atmosphere.2. Which is not the use of the water ondesert-like environment. Jakosky says it used to be much different.Mars?DWhen we look at ancient Mars, we see a different type...
Mars has ice caps, and there is evidence in the terrain that water flowed in rivers and lakes there billions of years ago. We have a decent understanding of how water behaves on Earth, and there's no reason to think the laws of physics are different on Mars. And yet, we can't ...
Although Mars' atmosphere is significantly thinner than Earth's, at least it has one and would create some sort of protective barrier for humans. Another important characteristic necessary for human settlement is natural resources like water, of which the moon is believed to have none. Mars, ...
"There's lots of evidence that in the past, Mars had running water, but to have running water you need a thick atmosphere, and that's gone now," said Lin, a UC Berkeley professor of physics and former director of the SSL. During its planned one-year mission, MAVEN will collect eviden...
Billions of years ago, Mars used to have water on its surface. But over time, this water was lost. Now scientists have created a computer simulation which shows how water vapor moves through the Martian atmosphere, and which could explain why Mars lost i
A. Why the moon has no water. B. Why the moon contains almost no iron. C. Why the moon is the largest moon in the solar system. D. Why the moon does not have a molten core.2 E. Earth´s moon used to orbit Mars. F. Mars was captured by the gravitational field of the Sun...
38. -People can't live without water orair-Y_(eS) -Y_(eS)⋅That'swhywecan'tliveOnMarS 火星) now. 4-People can't live without water orYes. That's why we can't live on Mars(火星) now.反馈 收藏
Lisa Pratt:I'm afraid I'm going to have to violently disagree. I think we have no reason whatsoever to think that Mars is dead or sterile or even hostile to life forms. I think it's increasingly evident that there is a large inventory of water on Mars. There may in fact be ground...
1. Why does Mars get the name “fire star”? A.Because it is red.B.Because it is rich in iron.C.Because it is the symbol of war. 2. When did scientists see Mars for the first time? A.Millions of years ago.B.Over 4, 000 years ago.C.More than 200 years ago. ...
I.阅读理解Earth is the only planet that scientists think has life.Why does Earth have life while the other planets(行星)don't? For one thing, Earth has just the right temperature. As the third planet from the sun, Earth seems to bejust the right distance away. The planets which are cl...