A photograph shared by NASA astronaut Christina Koch shows the boundary between day and night on Earth. (Image: © NASA) #Astronaut #InternationalSpaceStation #ChristinaKoch #NASA An evocative new photo from the International Space Station shows what it's like to fly along the line between darkness and daylight on planet Earth. Expedition 59 astronaut Christina Koch posted the eerie view on Twitter May 20 from one of the windows of the station; the view includes a glimpse of one the orbiting complex's solar arrays. Below, night gradually gives way to daylight as clouds streak above the Earth's surface. "A couple times a year, the @Space_Station orbit happens to align over the day/night shadow line on Earth," Koch wrote with the posted photo. "We are continuously in sunlight, never passing into Earth's shadow from the sun, and the Earth below us is always in dawn or dusk. Beautiful time to cloud watch." Koch added the hashtag #nofil