Astronauts on the ISS harvest radishes in space

Astronauts are harvesting fresh radishes grown in space, a delicious prospect that also could help seed food production efforts for longer-term missions to the moon and Mars.



Kathleen Rubins sitting at a table: NASA astronaut and flight engineer Kate Rubins checks out radish plants growing on the space station as part of an experiment to evaluate nutrition and taste of the plants.


© NASA
NASA astronaut and flight engineer Kate Rubins checks out radish plants growing on the space station as part of an experiment to evaluate nutrition and taste of the plants.

On Monday, NASA flight engineer Kate Rubins pulled out 20 radish plants grown in the space station’s Advanced Plant Habitat, wrapping them in foil for cold storage until they can make the voyage back to Earth next year.

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Radishes are the latest type of fresh produce to be successfully grown and harvested in zero gravity, joining “Outredgeous” red romaine lettuce, green lettuce, Chinese cabbage, lentils and mustard, according to a NASA fact sheet.

“I’ve worked on APH since the beginning, and each new crop that we’re able to grow brings me great joy because what we learn from them will help NASA send astronauts to Mars and bring them back safely,” said Nicole Dufour, the Advanced Plant Habitat program manager at NASA’s Kennedy Space Center, in a news release.

Food for future space missions

Back on the ground, scientists at the Kennedy Space Center in Florida are growing radishes in a control group set for harvest on December 15. The researchers will compare the space-grown radishes to the veggies grown on Earth, checking on how space produce measures up on providing the minerals and nutrients astronauts need as they prepare for longer trips.



The Advanced Plant Habitat cultivates radishes, a plant that is nutritious, edible and has a short cultivation time.


© NASA
The Advanced Plant Habitat cultivates radishes, a plant that is nutritious, edible and has a short cultivation time.

Meanwhile, astronauts will repeat the radish experiment in the heavens, planting and harvesting another round of radish crop to give scientists more data to draw from.

With their short cultivation time, radishes present potential advantages as a food source for future astronauts embarking on deep space missions in years to come. The radishes grow quickly, and they can reach full maturity in 27 days.

The root vegetables also don’t require much maintenance from the crew as they grow.

“Radishes provide great research possibilities by virtue of their sensitive bulb formation,” said Karl Hasenstein, a professor of biology at the University of Louisiana and the principal investigator on the project, in a news release.

Researchers will analyze the effects of carbon dioxide on the radishes as well as how the vegetables acquire and distribute minerals, according to Hasenstein, who has run plant experiments with NASA since 1995.

Astronauts have grown 15 different types of plants on the station, including eight different types of leafy greens. And NASA has already tested more than 100 crops on Earth, identifying which candidates to try out next in space.

“Growing a range of crops helps us determine which plants thrive in microgravity and offer the best variety and nutritional balance for astronauts on long-duration missions,” Dufour said.

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