Milky Way already have collided the Andomeda Galaxy 7-10 billion years ago

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By calculations of scientists through 3 billion years has to happen the collision of our galaxy of

the Milky Way and the Andromeda galaxy. But astronomers think that the meeting will be not their first meeting. Hongsheng Zhao from Saint-Endru University (Great Britain) and his colleagues analyzed movement of the Andromeda galaxy and Magellanic Clouds, galaxies satellites of the Milky Way. They used the modified Newtonian loudspeaker (MoND). This theory developed by the Israeli scientist Mordechai Milgrom in 1983, explains expansion of the Universe without participation of dark matter. He noticed that the Newtonian force of gravitation works only for the bodies moving with rather big acceleration, and doesn’t operate on small accelerations. And therefore acceleration depends not linearly on the weight creating it for objects of level of galaxies and their congestions. Still this hypothesis didn’t find weighty confirmations. Having calculated speeds of galaxies, Zhao and his colleagues calculated what their trajectories were in the past. According to the obtained data, after the birth our galaxy and the Andromeda galaxy dispersed, submitting to inertia of expansion of the Universe.  But thanks to their gravitational interaction then they again approached. Galaxies passed in very short distance from each other 7-11 billion years ago.
Milky Way collided with Andromeda Galaxy

Milky Way collided with Andromeda Galaxy

By the words of Zhao to explain the only way how two galaxies can pass by each other, without having faced is to assume lack of a dark matter. The data of supervision indicating rapprochement (galaxies), thus, will confirm the validity of MoND. Scientists consider that if the dark matter existed, its attraction would force galaxies to unite, and without it galaxies had to disperse, extending substance the friend from the friend, and forming long thin “sleeves”. Over time, these sleeves broke up to parts and formed small dwarfish galaxies, such as Magellanic Clouds and other satellites of the Milky Way.