Icy Moon Tidal Heating Simulator

An icy moon circles a giant planet on an ellipse whose eccentricity you control. Watch the moon's shape flex as its distance to the planet swings between periapsis and apoapsis each orbit, read the live tidal-heating gauge that spikes with every close pass, and fast-forward geological time to see whether that flexing is enough to keep a subsurface ocean liquid under the ice shell — or whether the whole interior freezes solid when the orbit is too close to circular.