Frame Dragging — Lense-Thirring Precession

General relativity says a spinning mass doesn't just curve spacetime — it twists it, dragging local inertial frames around in the direction of its rotation. This simulator renders that effect, the Lense–Thirring precession, around an interactive rotating neutron star: six gyroscopes orbiting at different inclinations have their spin axes slowly precess around the star's rotation axis, and a field of swirling reference arrows shows the drag strength falling off sharply with distance. Every number on screen — the precession rate, the orbital period, the time for a full 360° precession — is computed live from the real weak-field GR formula Ω_LT = 2GJ/(c²r³) as you change the star's mass, spin period and the orbit's radius, the same physics NASA's Gravity Probe B mission confirmed around Earth.