Tomato plants growing under red and blue LED lights. The plants are in a growth chamber inside a laboratory at the Space Station Processing Facility at NASA?檚 Kennedy Space Center, Florida, USA. Plant growth is being tested in the Veggie Passive Orbital Nutrient Delivery System (PONDS). PONDS units have features that are designed to mitigate microgravity effects on water distribution, increase oxygen exchange and provide sufficient room for root zone growth.