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Extensive living creatures on the Earth from 4.0 billion years ago to date lived and diversified under a specific physical & environmental condition of the Earth, where the Earth’s gravity plays an important role. But populations of this planet are growing so rapidly to the point of concern that the Earth’s Carrying Capacity has been surmounted. So, for maintaining the Carrying Capacity, it is important to find out another/other planets which are like the Earth. In our generation, there are some who believe that an ecosystem fit for human survival is creatable on Mars (Red Planet). Although there seems to be no life at present in Mars, there is substantial evidence, returned by various robotic missions, that in the early Mars’ history, liquid water environments existed, and conditions may have been suitable for the origin of native life.
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