The 4th-magnitude open star cluster M6 (NGC 6405) in Scorpius, consisting of several dozen stars arranged in the shape of a butterfly. It is about ¼° wide and lies 2000 l.y. away.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。