The star Alpha Boötis, magnitude −0.05, the brightest star north of the celestial equator and the fourth-brightest star of all. It is a K1 giant, 37 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。