The lettuce grew on the ISS for 33 days in microgravity, sustained by "plant pillows" that kept soil from escaping. Before eating the leaves, the astronauts had to wipe them off with citric acid wipes. NASA hopes that cultivating food in space will lead to new developments in farming on Earth, as well as ideas for agriculture on other planets. Fortunately, the presence of the plants is also thought to boost the moods of the astronauts.
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Key Facts In This Video
The Russian space station Mir had its own greenhouse. 00:17
Growing food on the ISS could help scientists develop new ways of growing food in inhospitable places on Earth. 01:40
The cosmological principle states that on large scales, matter in the universe should be evenly distributed. 03:04