spherically symmetrical

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• Gravitation — is a natural phenomenon by which objects with mass attract one another [http://math.ucr.edu/home/baez/physics/Relativity/GR/grav speed.html Does Gravity Travel at the Speed of Light?] , UCR Mathematics . 1998. Retrieved 3 July 2008] . In everyday …   Wikipedia

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• Maksutov telescope — A 150mm aperture Maksutov Cassegrain telescope. The Maksutov is a catadioptric telescope design that combines a spherical mirror with a weakly negative meniscus lens in a design that takes advantage of all the surfaces being nearly spherically… …   Wikipedia