astronomy
The Comet That Woke Twice: 220P/McNaught and the Living Sky
A small comet is moving through our solar system, carrying with it a reminder far larger than itself: the universe has not finished surprising us. Its name is 220P/McNaught. Under ordinary circumst...
北半球的观测者们，如果不去看看目前在夜空中占据主导地位的夏季大三角，那就太失礼了。正如其名称所示，这个广受欢迎的星群是由三颗明亮的恒星——织女星、牛郎星和天津四——组成的一个简单的三角形。