Astronomy Picture of the Day (APOD) — a daily project publishing images of space with explanations from professional astronomers — presented an image of the complete auroral oval obtained using the SMILE mission (Solar wind Magnetosphere Ionosphere Link Explorer). This joint project of the European Space Agency (ESA) and the Chinese Academy of Sciences (CAS) is designed to study the interaction of the solar wind with Earth's magnetosphere. The auroral oval is a ring-shaped zone around the planet's magnetic poles where polar auroras occur, caused by the interaction of charged particles from the solar wind with Earth's atmosphere. Normally, observers on Earth's surface see only part of this phenomenon, however orbital spacecraft such as SMILE are able to capture the complete picture of the oval in its entirety, which gives scientists a more comprehensive understanding of the dynamics and scale of polar auroras. The SMILE mission was launched to study the connection between the solar wind and the planet's magnetosphere, as well as to investigate the mechanisms leading to geomagnetic storms. Images such as those published on APOD help astronomers and space physicists better understand the processes occurring during the interaction of solar activity with Earth's magnetic field. APOD continues the daily tradition begun decades ago, providing access to an archive of images, educational materials, and opportunities for discussion of presented images with professional astronomers and astronomy enthusiasts from around the world.