Sources:
Nasa's Curiosity rover finds water in Martian soil | Science | The GuardianAnalysis of Surface Materials by the Curiosity Mars Rover
What about the planet?
"Our" planet Earth has been there a long time ago before the living creatures of the Nature appear on it.
Is necessary to preserve and protect our house, the planet and all the known Nature processes and creatures. If we fail there are a lot of possibilities to affect the Nature in a way that we really don't understand and could suppose a lot of problems including the extinguishing of some of the Nature processes or creatures.
Read this file for more information.
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