Science of Light

The sun is our main source of light.

NASA

Learning more about the science of light and human vision will help us understand the value and fragility of natural lightscapes. During the day, the surface of the planet is bathed in light from the sun. The energy in sunlight drives weather, the water cycle, and ecosystems. But at night, in the absence of bright sunlight and clouds, our atmosphere turns transparent and allows us to see beyond our planet into the vastness of the cosmos.