Astronaut pee could keep plants alive in space for decades


By Swapna Krishna ASTRONAUTS on a mission to Mars or beyond may be able to survive on plants watered with their own urine. Our liquid waste is 95 per cent water. The other 5 per cent is composed of nutrients such as nitrogen, potassium and phosphorus, which may pose harm to humans over the long term — but not to plants. Using computer models of dwarf wheat and soya plants,
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