M33 is also called the Triangulum Galaxy for the constellation in which it resides. M33's proximity to M31 causes it to be thought by some to be a satellite galaxy of this more massive galaxy. M33's proximity to our Milky Way galaxy causes it to appear more than twice the angular size of the full moon , and visible with a good pair of binoculars . In the above picture , visible light is shown in red and ultraviolet light superposed in blue . Stars in M33 are the most distant ever to be studied spectroscopically .
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