The largest telescope at Kitt Peak National Observatory, Arizona, aperture 4 m, opened in 1973. It is named after a former director of Kitt Peak, Nicholas Ulrich Mayall (1906–93).
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。