Earth is not somehow a separate place from space. Our climate’s biggest driver is the light from our Sun, which drives wind and ocean currents, enables plants to grow, and makes the seasons change. Our moon controls the daily flow of tides around the Earth. Asteroid impacts have shaped not only the surface of the planet, but the path of life as it evolved. Our atmosphere is the only barrier between all known life and the vast vacuum of space. Understanding that fragile, thin envelope of air and wind can’t be accomplished by only studying what happens at the lowest level of our atmosphere, where it meet’s the Earth’s surface. If we want a full picture, we need to also monitor what’s happening at the atmosphere’s outer boundary, where it meets the great unknown.