Galaxy collisions dominate the local universe
6th Dec 2005, 14:26 GMT
More than half of the largest galaxies in the nearby universe have collided and merged with another galaxy in the past two billion years, according to a Yale astronomer in a study using hundreds of images from two of the deepest sky surveys ever conducted. Though there are not many direct, star-to-star encounters in this process, galaxy collisions have profound effects on star formation rates and the shape of the resulting galaxy.
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