ROBERT GENDLER & JIM MISTI / SCIENCE PHOTO LIBRARY ROBERT GENDLER & JIM MISTI / SCIENCE PHOTO LIBRARY
Barred spiral galaxy M109. This galaxy lies around 41 million light years from Earth in the constellation Ursa Major. It has blue spiral arms full of hot young stars. Its nucleus is yellow as it contains older stars and more dust, which scatters blue light. The nucleus has an elongated bar shape, hence its classification as a barred spiral. It is thought that our Milky Way galaxy has such a bar, and as such closely resembles M109.
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