This image shows the International Space Station (ISS) alongside our Moon. The long shadows close to the Moon’s terminator highlight its geological formations. At the top of the image are the Montes Apenninus, where some peaks reach over 5000m (16,400 feet). At the bottom is another curious formation: the Rupes Recta, a long fracture line, which is enhanced by the oblique illumination from the Sun. Also known as Thebit and Huygens’s Ancient Sword, its straightness makes it seem like a distant railway line.