![](https://nthumb.tpgimages.com/mid2_ocom_img/dW5pdmVyc2FsX2ltYWdlcw==/20120511_4_rm/2012051516/top_20120515162547_8119.jpg/TOP09163108.jpg)
Supernova remnants resolved at GeV gamma rays from of different ages and in different environments. W51C, W44 and IC 443 are middle-aged remnants between 4,000 and 30,000 years old. Credit NASA. Science Astronomy
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TOP09163108
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達志影像
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RM
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