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Astronomy pictures of the week (2012.12.2-12.8) (7)

People's Daily Online)  08:06, December 10, 2012

Plasma Jets from Radio Galaxy Hercules A. Why does this galaxy emit such spectacular jets? No one is sure, but it is likely related to an active supermassive black hole at its center. The galaxy at the image center, Hercules A, appears to be a relatively normal elliptical galaxy in visible light. (Photo/ NASA)


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(Editor:姚春、张茜)

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