Astronomers speculate that this strange bubble was created by a massive central black hole that resides there. As gas swirls around the black hole , gravity and friction pull it in and heat it up. Some of the hot gas then falls into the black hole , but not all - some gas gets so hot it shoots out the poles in fast jets . When these jets impact nearby material, they heat it up and cause the detected glow. Galaxy NGC 4438 resides about 50 million light years from Earth , and the pictured central bubble measures about 800 light-years across.
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