从南十字星到海山二星
影像来源与版权:Carlos Fairbairn

说明:这幅美丽的天体影像呈现了拍摄于巴西黑暗天空下的南天银河系景象。该影像跨越了约20度的天区,它实际上开始于影像左下方、位于南十字星臂膀下的煤袋星云黑暗区域。这个致密星座的顶部是淡黄色亮星十字架一,它是一颗距离我们只有88光年远的低温巨星。一条从十字架一穿过十字架底部的蓝色恒星十字架二的直线指向南天极方向。沿着银河系向右看,你的视线将扫过被称为半人马λ星云的IC 2948,最后到达影像右侧边缘附近的海山二星和船底座星云。船底座星云的大小约200光年,是一个比更靠北的恒星孕育场-猎户星云还要大的恒星形成区。船底座星云距离地球约7500光年远,位于银河盘面上。
翻译:北京天文馆

Southern Cross to Eta Carinae
Image Credit & Copyright: Carlos Fairbairn

Explanation: Tracking along the southern Milky Way this beautiful celestial mosaic was recorded under dark Brazilian skies. Spanning some 20 degrees it actually starts with the dark expanse of the Coalsack nebula at the lower left, tucked under an arm of the Southern Cross. That compact constellation is topped by bright yellowish Gamma Crucis, a cool giant star a mere 88 light-years distant. A line from Gamma Crucis through the blue star at the bottom of the cross, Alpha Crucis, points toward the South Celestial Pole. Follow the Milky Way to the right and your gaze will sweep across IC 2948, popularly known as the Running Chicken nebula, before it reaches Eta Carinae and the Carina Nebula near the right edge of the frame. About 200 light-years across, the Carina Nebula is a star forming region much larger than the more northerly stellar nursery the Orion Nebula. The Carina Nebula lies around 7,500 light-years from Earth along the plane of the Milky Way.
Astronomy Picture of the Day 04/26/2019