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Throughout the universe, there are winds 10,000 faster and stronger than those on Earth. These winds could be formed by the intense emission of light and particles from light stars. They can be also formed by the massive energy of explosions of old stars. Another way these winds could be formed is by the matter of objects swirling around the black hole in the center of the galaxy. The winds were so strong that they basically torn the galaxy apart. The winds intertwined and moved the stars out of place causing the galaxy to change its shape.
Information from: http://www.livescience.com/14226-galaxy-wind-storms-molecular-gas.html