Population explorer · colour–magnitude · sky · period–luminosity · period–amplitude

Four views of a variable sky

Every variable occupies a place in four diagrams at once — where it sits in temperature and brightness, where it lives in the Galaxy, how it pulses or eclipses, and how its period betrays its true luminosity (the rung of the distance ladder). Drag a box on any panel to select a population; it lights up across all four. Hover a star to find it everywhere.