Many people assume that there is life on other planets like theEarth. On another planet where there is water and air, as the example of Mars. In my opinion, we can learn if sending humans on other planets is possible. But, sending astronauts not as easy as we imagine, the cost is very expensive, and long trips in space can cause many health problems in humans. Despite these concerns, sending people into space seems certain. In the future, we might see lunar cities and maybe even new human cultures on other planets. I think the next stop for the people is MARS.
image link : http://en.wikipedia.org/wiki/File:Astronaut-EVA.jpg
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