About Mars 

    Mars is a bit smaller than the Earth,it's semidiameter is 53% of that of the Earth,and it's volume is Earth's15%,the mass is 11% and the superficial gravity is 38%.There are thin air surrounding the Mars, 95% of them is carbon dioxide and 3% is nitrogen ,the atmospheric density is about 1% of that on the Earth.The Mars autorotating a circle every 24.63 hours,and revoluting around the Sun with a period of 687 days in a slant angle of 25.2 degree along the elliptic orbit.So just as the Earth, there are four clearly seasons on the Mars,the minimum temperature in the winter is negative 125℃,the highest temperature in summer is 22℃,and the average temperature is -63℃.Therefore,although the natural enviroment on the Mars is not suitable for the human beings,compared with the Moon,it is much better.Although at present no liquid water is discovered on the Mars,the sign of current detected shows that there was flood in the past,besides,the scientists found a lot of ice existed in the two poles of the Mars.  

    On the other hand,there are green clays and eruption on the Mars,which is good for the growing of plants;there are also plenty of carbon dioxide gas in the Mars atmosphere ,which can improve the efficiency of photosynthesis and enable a larger harvest than on the Earth.The oxidizing substance like iron oxide existed everywhere on the Mars,so the Oxygen can be deoxidized.What's more,there are abundant energy on the Mars:such as the wind energy is much more than that on the earth; the geothermal energy on the Mars;the methane fuel produced by carbon dioxide and hydrogen;the nuclear power generation with heavy hydrogen and so on.There are volcanicity and kinds of metalliferous minerals formed by rush of current on the Mars,which is superior to the metallic element spread in the terram on the Moon.