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Messier 57
Gú-giân
kàm-sī
Siu-kái
Messier 57
(
M
57,
NGC
6720) sī chi̍t-ê
chhiⁿ-hûn
, tī
thian-kiû
ê só͘-chāi sī
Lyra-chō
.
Messier 57
