By 2011 debris in the centerof the ring, which is about a light-year in diameter, was blazing more intensely as the supernova entered a new stage of stellar demise.
The green ring structure near the centerof the image is about 77 light-years across.
图片中间的绿色环状结构的跨度大概有77光年。
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"The ring itself is a fascinating object worthy of study because it is forming stars at a very high rate," Kartik Sheth, an astronomer at NASA's Spitzer Science Center, said in a press release.