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Structure
Most planetary nebulae are symmetrical and have a nearly spherical form, that does not prevent them to have a lot of very complex forms. Approximately 10% of planetary nebulae almost bipolar, and only a small number asymmetrical. Known even rectangular planetary nebula. The reasons for this diversity of forms has not been clarified, but it is thought that could play a big role gravitational interactions of stars in binary systems. According to another version of the world violates even spreading of matter in the formation of the nebula. In January 2005, U.S. astronomers announced the first detection of magnetic fields around the two central stars of planetary nebulae, and then put forward a suggestion that they are partly or wholly responsible for the creation of these nebulae. The essential role of magnetic fields in planetary nebulae was predicted Grigor Gurzadyanom back in 1960th years (see eg Gurzadyan GA, 1993 and references therein). It is also assumed that the bipolar shape can be attributed to the interaction of shock waves from the front of propagation of detonation in a layer of helium on the surface of the emerging white dwarf (eg, Cat's Eye Nebula, an hourglass, Muravei).