Our eyes are only able to see a very small portion of the electromagnetic spectrum, so scientists have needed to find different ways of gather information on the wavelengths that we can’t detect. Each different wavelength is able to provide different types of data regarding the structure, composition, or temperature the galaxy or any object being studied.
These images show Andromeda Galaxy in different wavelengths. The Andromeda Galaxy is about twice as big as the Milky Way. It is about 2.5 million light years away from us but it is moving towards us at 250 mph and in about 3 billion years, it will collide with our galaxy.
Sources:
http://en.wikipedia.org/wiki/Andromeda_Galaxy
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