You are looking at the edge view of UGC 10288—a spiral galaxy located 100 million light-years away from Earth. UGC 10288 has been puzzling astronomers for a long time because of that weird thing coming out of it. Now, the mystery has been solved at last.
New detailed radio data from the NRAO's Jansky Very Large Array has revealed that this 11,000 light-year long blue jet is actually another galaxy which is even farther away: 7 billion light-years.
But that galaxy has its own mysteries. The new detailed radio images show "that the gas in the galaxy's "outskirts," high above its spiral disk of stars, is not a smooth, halo-like envelope, but instead has smaller, discrete features. One of these features is arc-like, rising more than 11,000 light-years above the disk."