Analysis of information sources in references of the Wikipedia article "NGC 7009" in Chinese language version.
NGC 7009 is a planetary nebula with several morphological and kinematical sub-systems with multiple shells, a halo, jet-like streams, ansae and small-scale filaments and knots.
NGC 7009 is a planetary nebula with several morphological and kinematical sub-systems with multiple shells, a halo, jet-like streams, ansae and small-scale filaments and knots.
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值 (帮助). SIMBAD. 斯特拉斯堡天文資料中心. [2006-12-26].