This article talks about how looking at Earth from space helps us understand how the whole planet works as a system. NASA started studying Earth's system in the 1980s to figure out how things like the atmosphere (air), hydrosphere (water), geosphere (land), and biosphere (life, including humans) interact and change over time. The main idea is to see how everything on our planet is connected and how it's changing. The researchers found that studying Earth from space gives us a special view to study these big global processes that affect our planet.