UPDATED: May 14, 2021 13:35 IST Astronaut Mike Hopkins works with the PWM hydroponics test cell on the space station. (Source: Nasa) As humans vie to become interplanetary, one of the critical needs will be food. While at first the colonies that likely come up on another planet in the future will be stocked with supplies from Earth, over time humans will have to look at the science of growing food in inhospitable environments. In a bid to push the envelope on farming beyond Earth, Nasa is close to determining the most effective way to provide adequate hydration and aeration for plants to grow...