When astronauts go to the planet Mars years from now, they will need the right food to stay strong and healthy. At NASA, the American space agency, scientists are working to create food products that provide nutrition without weighing down the spacecraft. For the first step to Mars, NASA plans to send astronauts past the moon on what are called deep space missions. They will travel in the Orion spacecraft, which has limited space for food and other supplies. This is different from the International Space Station (ISS). Its crew members can choose from about 200 food products. Another difference is that Orion’s flights into deep space will not involve other vehicles carrying supplies, or taking away trash. The Orion crew will have to take everything they need with them, and then bring everything back home.