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Overview
About the CoverThe image on the cover (NGC 6240) is a well-studied nearby ultra luminous infrared galaxy in the constellation Ophiuchus. This galaxy is the remnant of a merger between two smaller galaxies. The collision between the two galaxies has resulted in a single larger galaxy with two distinct nuclei.
Colliding galaxies are pairs of galaxies caught by the tug of their own mutual gravitational attraction. Just like a Man and a Woman some colliding galaxies eventually merge to form a new whole or become one, while other colliding galaxies eventually part. In the process of becoming one these galaxies will continue to pull and tug at one another for...