Proper motions of Galactic Planetary Nebulae
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More than 1500 Galactic planetary nebulae (PNe) are known but only a tiny fraction of them have measured proper motions. To date, the largest set of proper motion (PM) data for...
目前已知的银河行星状星云（Galactic planetary nebulae, PNe）超过1500个，但其中仅有极小一部分被测定过自行（proper motion, PM）数据。截至目前，针对……的最大规模自行（proper motion, PM）数据集仍为……
