A large number of signs also show that the Mars is likely to be the same as the current Earth, only after billions of years of evolution into the atmosphere thin, low temperature, water depletion and so on.
大量迹象还表明，火星以前很可能与目前的地球一样，只是经过几十亿年的演化才变成大气层稀薄、温度较低、水源枯竭等样子。