Monday on the International Space Station, a batch of romaine lettuce became the first food grown and consumed in space. The leaves were harvested from NASA's experimental plant growth system called Veg-01, a microgravity environment in which plants grow from seed "pillows" under primarily red and blue LED lights.
In 2014, an astronaut on NASA Expedition 39 grew and harvested the first plants from Veg-01 and then sent the plants back to Earth for food safety analysis. This time around, the crew members of Expedition 44, including astronaut Scott Kelly, who is four months into a yearlong space mission, got to enjoy the bounty. Kelly activated the seed pillows on July 8, and then tended to the plants for 33 days before harvesting.
While this isn't NASA's first experiment designed to test the growth of plants in controlled-environment agriculture settings (scientists previously designed a habitation to grow plants on the moon), this is the first and only experiment to evaluate the effect of plant life on humans in space.