Lagrange Points

The Lagrange points mark positions where the combined gravitational pull of the two large masses provides precisely the centripetal force required to rotate with them. They are analogous to geostationary orbits in that they allow an object to be in a "fixed" position in space rather than an orbit in which its relative position changes continuously. - Wikipedia

After the successful terraforming of Mars, the need for space stations near Earth became grew substantially. This need was met by several corporations that investing in aggressive, ambitious, and sometimes hap-hazard construction of space stations along the five Lagrange Points of Earth's orbit. These became:

• Griton 1 at L4
• Griton 2 at L5