Softening saves you from slingshot infinities. Substeps save you from spiral-out.
Drag length is velocity. Short drags circularize. Long drags escape. Shift buys mass.
Overlapping radii conserve momentum into the heavier body. The log names the survivor.
Bodies past the margin are counted and freed. Apoapsis keeps the record.
Keyboard: F fires a fleet, X clears, P pauses.
Symplectic Euler with two substeps per frame. Stable enough for play, honest about energy.
Double-click the file. The solver, grid and trails run with zero network.
Integrated, merged and counted in one file. Rulings from the bench.
Two substeps per frame. Softening 24 by default.
Ring buffers to 160. Heavy stars draw faint and wide.
Escapes, mergers, stable orbits and apoapsis tracked live.
F fleets, X clears, P pauses. Click seeds, shift-click stars.
The HUD sums kinetic live. Mergers conserve momentum exactly.
Double-click to open. Solver, grid and log run locally.
Print: the field becomes a mission chart. Page 023 · 2026.