Escape Velocity
Interactive simulation — adjust parameters and watch the visualization update in real time.
How it works
From distance r from the center of a spherical body, the escape speed is v_esc = √(2GM/r). Launch radially outward: below v_esc the probe stays bound (ellipse); at or above v_esc the specific mechanical energy is non-negative and the trajectory can reach infinity. Circular orbit speed √(GM/r) is smaller by √2 — compare the readouts. Planet presets scale GM and radius for a qualitative feel, not astronomical accuracy.
Key equations
E = ½v² − GM/r · escape when E ≥ 0
v_esc = √(2GM/r), v_circ = √(GM/r)