DR JEAN LORRE / SCIENCE PHOTO LIBRARY. DR JEAN LORRE / SCIENCE PHOTO LIBRARY.
Image processed optical photograph of the spiral galaxy, M81. The original optical photograph is processed through a range of filters to emphasise the natural colours & thereby highlight the distribution of different types of stars. The older reddish stars cluster at the centre of the photograph while younger blue stars are strung along the slender arms of the spirals. M81 is in Ursa Major ( Great Bear), a large & conspicuous constellation in the northern hemisphere.
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