The star Epsilon Orionis, magnitude 1.7, the middle star of the belt of Orion. It is a B0 supergiant, estimated to be about 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。