Zero-velocity surface

Zero-velocity surface

The zero-velocity surface is a concept that relates to the N-body problem of gravity. The zero-velocity surface is particularly significant when working with weak gravitational interactions among orbiting bodies.

Galaxy clusters

Given a group of galaxies which are gravitationally interacting, the zero-velocity surface is used to determine which objects are gravitationally bound (i.e. not overcome by the Hubble expansion) and thus part of a galaxy cluster, such as the Local Group.

Lagrange points

The zero-velocity surface is also an important parameter in finding Lagrange points.

External links

* [http://www.math.utexas.edu/users/jjames/celestMech Celestial Mechanics: Notes and Work]
* [http://www.astr.ua.edu/keel/galaxies/clusters.html Groups and Clusters of Galaxies]
* [http://farside.ph.utexas.edu/teaching/336k/lectures/node138.html Zero-Velocity Surfaces]


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