Explanation: Lagrange points – Lagrange points are positions in space where objects sent there tend to stay put.

• At Lagrange points, the gravitational pull of two large masses precisely equals the centripetal force required for a small object to move with them.
• These points in space can be used by spacecraft to reduce fuel consumption needed to remain in position.
• Of the five Lagrange points, three are unstable (L1, L2 and L3) and two are stable (L4 and L5).

Source: FORUMIAS