One of five points in the plane of orbit of one body around another (e.g., the moon around the earth) at which a small third body can remain stationary with respect to both.
- Its space segment will be composed of a group of X-ray telescopes based around one of the libration points or Lagrangian points.
- Finding asteroids on Saturn's Lagrangian points is difficult and has not yet been accomplished.
- Herschel, Planck and Gaia are all observatory missions that will be positioned at the Lagrangian point L2, 1.5 million kilometres behind Earth as seen from the Sun.
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