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眼睛想旅行 一夜看遍110个深空天体的「梅西尔马拉松」｜STEM教室
梅西尔天体（Messier Object，又名M-Object） ...
From nebulas to planets: NASA shares 7 best images
NASA's Hubble Space Telescope captured Cat's Eye Nebula (NGC 6543) which shows a bull's eye pattern of eleven or even more concentric rings, or shells, around the Cat's Eye. NASA captured stunning ...