Lagrange points are five specific positions in the gravitational field of two large bodies (such as the Earth and Moon, or the Earth and Sun) where a smaller object experiences balanced gravitational forces, allowing it to maintain a relatively fixed position. L1, L2, and L3 are unstable equilibria along the line connecting the two bodies, while L4 and L5 form stable equilibria at 60-degree angles ahead of and behind the smaller body.
The Sun-Earth L2 point, 1.5 million km from Earth, hosts the James Webb Space Telescope and is prized for its thermal stability. The Earth-Moon L1 and L2 points are of growing interest as staging areas for cislunar operations, potential refueling depots, and communication relay stations for the far side of the Moon.