This weeks APOD is the enormous galaxy cluster ACT-CL J0102-4915, more colloquially known as El Gordo. This name, which means "the big one" in spanish, accurately reflects the nature of the object, as it is thought to possibly be one of the largest celestial objects known. It spans over 7 million lightyears, and contains mass equal to over a million billion suns. This particular image is a composite image that is comprised of several images taken in different wavelengths. The different colors represent different gasses, with the exception of the blue. The blue, interestingly enough, represents what scientists believe to be concentrations of dark matter.
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