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| a bright red supergiant star in the constellation Orion |
| a large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space |
| Lagrangian point | |
| —n | |
| astronomy one of five points in the plane of revolution of two bodies in orbit around their common centre of gravity, at which a third body of negligible mass can remain in equilibrium with respect to the other two bodies | |
| Lagrangian point (lə-grān'jē-ən) Pronunciation Key
A point in space where a small body with negligible mass under the gravitational influence of two large bodies will remain at rest relative to the larger ones. In a system consisting of two large bodies (such as the Sun-Earth system or the Moon-Earth system), there are five Lagrangian points (L1 through L5). Knowledge of these points is useful in deciding where to position orbiting bodies. |