Mars Settlers Could Use CO2, Water, & Sunlight To Make Drugs & Plastic
colonize Mars. However, as you could imagine, shipping things to the big red planet is not easy. It’s ridiculously expensive, and there’s a limited amount of space available in a spaceship for cargo. But the settlers will need things to survive! And yet, Mars lacks a wide range of organic compounds humans can’t live without, but that can’t be shipped from Earth. So, the peoples’ best bet is to send compact devices that can manufacture those necessities. A team of NASA funded chemists from Lawrence Berkeley National Laboratory (Berkeley Lab) and the University of California, Berkeley, has a plan. Their research, now almost a decade in the making, has resulted in the development of a hybrid system of nanowires and bacteria that spits out the building blocks of organic molecules. The biohybrid, essentially a nano-power-plant, captures the energy from sunlight to convert water and carbon dioxide into these building blocks. Both water and CO2 are abundant on Mars. Project leader Peidong Yang, the S. K. and Angela Chan Distinguished Chair in Energy at UC Berkeley and a professor of chemistry, said:
On Mars, about 96% of the atmosphere is CO2. Basically, all you need is these silicon semiconductor nanowires to take in the solar energy and pass it on to these bugs to do the chemistry for you. For a deep space mission, you care about the payload weight, and biological systems have the advantage that they self-reproduce: You don’t need to send a lot. That’s why our biohybrid version is highly attractive.

These silicon nanowires are essentially like an antenna: They capture the solar photon just like a solar panel. Within these silicon nanowires, they will generate electrons and feed them to these bacteria. Then the bacteria absorb CO2, do the chemistry and spit out acetate.
