Astronauts could someday benefit from recycling human waste on long space trips using a yeast and  a carbon fixing cyanobacteria or algae
Credit: American Chemical Society
Imagine you’re on your way to Mars, and you lose a crucial tool during a spacewalk. Not to worry, you’ll simply re-enter your spacecraft and use some microorganisms to convert your urine and exhaled CO2 into chemicals to make a new one. That’s one of the ultimate goals of scientists who are developing ways to make long space trips feasible. Astronauts can’t take a lot of spare parts into space because every extra ounce adds to the cost of fuel needed to escape Earth’s gravity...
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