Io — moon orbiting Jupiter, shown live in Cosmoscope, a real-time 3D map of the universe.
A world being kneaded alive: Jupiter’s gravity pumps so much heat into Io that it constantly turns itself inside out with sulfur volcanoes.
Cosmoscope puts Io at its true position in the solar system, computed from JPL-derived ephemeris and updated continuously. Open the live 3D view to see, in real time, how far Io is from the Sun and from Earth right now, how many minutes or hours light takes to cross that gap, and how fast it is moving along its orbit. Scrub the timeline to place Io where it was on any past date, or where it will be years from now.