This is an artwork of a gas-giant exoplanet that orbits so close to its star that its atmosphere is being stripped away by the star's fierce ultraviolet flux. The planet goes by the catalogue name of HD 209458b, and is also known as Osiris. Osiris orbits its star at only one-eighth of the Mercury-Sun distance, with a period of 3.5 days, and has an estimated surface temperature of around 1000 degrees Celsius. The system lies 159 light-years away in the constellation Pegasus.