A rocket starts into space. It starts in South America. On board is the satellite Flex. It flies around the Earth. Flex watches the plants on Earth.
Plants make food from light. This process is hard to see. Plants glow very softly then. People cannot see this glow. The satellite Flex can measure it.
The glow shows the health of plants. Is a plant sick? Then the light changes. This happens at dry time or illness. The satellite finds the problem fast.
A plant looks healthy sometimes. But Flex finds the stress early. Experts make a map from this. The map shows the health of nature. This helps to protect nature.
A second satellite is there too. It is named Sentinel-3C. It watches the ice and seas. Tech from Austria helps the satellite. It protects the tool from cold space.
