Eu:CROPIS (Euglena and Combined Regenerative Organic-Food Production in Space) was a life science satellite developed by the German Aerospace Center (DLR) and intended to investigate the possibility of growing plants (specifically tomatoes) in different levels of gravity, such as that of the Moon and Mars,[1] as a sustainable food source using human urine for moisture and as the source of fixed nitrogen.

This orbital mission was intended to simulate and teste two greenhouses that could be scaled up and assembled inside a lunar or Martian habitat to provide the crew with a local source of fresh food, while recycling human urine into fertiliser.

[7] The closed system featured moisture, pH, oxygen, pressure and temperature sensors, and was capable of controlling these parameters.

Eu:CROPIS was intended to examine the possibility of using previously disposed waste to grow fruits and vegetables after proper conversion.

The satellite features four gyroscopes, two magnetometers, three magnetic torque rods and a Sun sensor in combination with a single-frequency Phoenix GPS receiver for attitude control.

The three supporting payloads generated large amounts of data, but the eponymous Eu:CROPIS experiment failed to activate due to a software problem.