For humans to survive we need oxygen, therefore any planet which does not have oxygen would be unsuitable for us to live on. We sure have and that's why we decided to find out what it might be like to live on other worlds in our solar system, from Mercury to Pluto and beyond in a new, weekly 12-part series. One thing is for sure—we need to get our own house in order first. Take energy production: In order for humans to live on another planet, we will need to develop a way to produce electricity. Mars is a hostile planet, and is currently unable to support human life. of Labor's OSHA defines 19.5 percent oxygen content as the minimum safe concentration for humans. To survive on Mars, humans need the same things they need on Earth: water, a breathable atmosphere, and food. References "Journey to Mars." If we ever become—perhaps if we need to become—a multi-planet species, exactly how many settlers would be needed for survival on another planet? We also need a supply of water. Humans need to colonize another planet within 100 years or face the threat of extinction, high-profile physicist Stephen Hawking has warned. None of us would be alive today without plants, and if humans want to survive beyond Earth long-term, we’ll need to bring our leafy greens with us. We need water for many reasons such as to grow food or for other animals. NASA.gov; Gregory L. Matloff. Stephen Hawking has said our time on Earth is running out and we must start searching for new planets to live on if we are to survive as a species. But before humans venture to distant worlds, they'll most likely be starting with a colony on the moon. For reference, the U.S. Dept. Hell, we can't even go everywhere on Earth.Try climbing a large mountain without an oxygen supply. The late physicist Stephen Hawking believed that humanity needs to colonize another planet within the next century, if it is to avoid the threat of extinction [source: Kharpal]. 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