Lagrange points are locations in space where the gravitational and centrifugal forces of two large celestial objects (such as a star, planet, or moon) are in balance. This creates a series of sites (each pair of objects will have five Lagrange points, L1-L5) where a smaller object can be held in place relative to the other two larger objects even as one orbits the other. Lagrange points tend to collect asteroids, asteroid fields, and in fictional worlds, space debris, and derelict ships. They may be ideal locations for space stations as a space station at this location will need to use minimal fuel or energy to remain in place relative to the other two orbiting objects.

Lagrange points are fixed locations relative to the other celestial objects – as the smaller object orbits the larger, the Lagrange points created orbit as well. Objects captured or placed within the Lagrange point will remain at that location relative to the other objects.