Space Research Orbit: Kepler Mechanics Lab (2D)

The 3D original dresses up a set of decorative sliders — "research level," "discovery level," "innovation level" — that just recolor spinning props with no formula behind them. This 2D companion replaces that dashboard with the actual physics a space-research probe runs on: real two-body Newtonian gravity, a = -μr/|r|³, integrated with 4th-order Runge–Kutta so the orbit stays numerically honest over long runs. Set the probe's starting radius and launch speed relative to the local circular velocity to shape an ellipse, a near-parabola, or an outright hyperbolic escape, then fire prograde or retrograde burns to raise, lower, or circularize the orbit — every number in the side panel (semi-major axis, eccentricity, periapsis/apoapsis, orbital period, cumulative Δv) is derived live from the probe's own energy and angular momentum, not scripted.