Key to humans exploring and settling Mars will be the ability to grow food on the Red Planet, and NASA is working on that.
It's a real challenge. The surface of Mars receives only half the energy from sunlight that Earth does, and far more dangerous radiation. Martian gravity and atmospheric pressure are also much lower. None of that is good for raising crops. NASA, therefore, is looking at constructing greenhouses on Mars, complete with their own atmospheres, radiation shielding, and artificial lighting.
The agency is planning to send people to Mars in the 2030s.
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