Captured in 2019 by astronaut Christina Koch on the International Space Station, this image shows day transitioning into night. Also visible is Earth’s delicate atmosphere, with a thickness of only 1.57% the Earth’s radius. In a universe consisting primarily of temperatures beyond our comprehension, this delicate atmosphere ensures livable temperatures for all beings. Complex and interconnected processes—such as the water cycle—regulate those temperatures, and these processes must be protected from the dangers of global warming.
