What should humans eat when they immigrate to Mars?

Today, people's impression of space food may still stay in the early days of space exploration. At that time, astronauts could only eat some mushy food packed in hoses, such as meat pulp, fruit pulp, or some convenient small pieces or freeze-dried food. ? In fact, with the development of space industry, great changes have taken place in space food. Now, astronauts on the International Space Station can eat more than 170 kinds of staple foods, snacks and drinks, such as hamburgers, patties and desserts. Although space food has changed a lot and its taste is rich, it still maintains a relatively single form-dryness. Astronauts can only eat by heating or humidifying. So, since there are so many foods in space, can these foods and this monotonous food form satisfy life on Mars?

One of the studies is related to diet. In the laboratory, researchers have to cook a meal with things in the storage room, which mainly include some storable foods, such as canned eels, egg crystals, baking soda, lentils, dried chicken and beef, and other ready-to-eat foods and freeze-dried foods. This experiment mainly tests the advantages and disadvantages of two different cooking modes-ready-to-eat mode and cooking mode. The results show that most astronauts prefer vegetables and foods that need to be cooked. These foods are easy to cook and taste good. ?

However, the soil on Mars is difficult to grow vegetables on the earth, so NASA has specially studied how to grow vegetables in space. They made a plant growth system called "vegetable box". The "vegetable box" is about the size of a double chest of drawers, which contains a cultivation mat and nutrients of soil and fertilizer for vegetable seeds. A special irrigation system is designed at the bottom to solve the problem of space watering. This box uses a set of LED lights to provide illumination for vegetable seeds. In addition, the special structure of the box can also absorb the heat and carbon dioxide of the space capsule, and build a certain ecological cycle for vegetable planting. ? This "vegetable box" harvested a crimson lettuce, which can be eaten as long as it is wiped with a non-toxic paper towel. Now, NASA is using this special plant growth system to test other vegetables, such as peppers, radishes and tomatoes, to see if this growth system is suitable for the growth of most vegetables, and to provide reliable help for the diet of Mars residents in the future.

However, the "vegetable box" cannot be expanded on a large scale, and it is difficult to meet the diet of a large number of Martian residents in the future. Therefore, scientists envision a recycling ecological environment on Mars in the future. In fact, there are some areas on the earth whose environment is similar to that of Mars, and these areas have played a very important role in the study of constructing the life circle of Mars.