The 8th-magnitude planetary nebula NGC 3918 in Centaurus. The name was given it by J. F. W. Herschel, who described it as like Uranus but larger. It is about 2600 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。