说明: 当你的眼睛适应黑暗之后，你将会看到壮丽的星空。正如这个月初於加拿大的安大略省所见，有部份的夜空影像也倒映在湖面上。首先，肉眼可见最明亮的天体是木星，位於影像的左上方。地平线上瀰漫著远方城市的灯光。还有更昏暗的是，我们银河系的盘面看起来就像是天空中一个扩散的云带，撞向远方的地平线上。在前方，可以看到美丽的地景，包括了树木，湖泊，以及岩壁。最后，在这个七月的夜晚，湖面难得地相当寧静，因此可以看到倒影。湖面上的倒影不仅只有几颗亮星，还有一部份的银河。然而，仔细观赏这张影像可以观察到在湖面倒影中的亮星会拖著一条小小的尾巴，但这是天空中的星星看不到的。这是因为上面这张照片是同一台相机的连续曝光经过数位合成的影像。在第一组曝光时，为了使天空中的星星保持在相同的位置，影像是稍微旋转过的。
转自成大
The Milky Way Over Ontario
Credit & Copyright: Kerry-Ann Lecky Hepburn (Weather and Sky Photography)
Explanation: Sometimes, after your eyes adapt to the dark, a spectacular sky appears. Such was the case earlier this month over Ontario, Canada, when part of a spectacular sky also became visible in a reflection off a lake. To start, the brightest objects visible are bright stars and the planet Jupiter, seen as the brightest spot on the upper left. A distant town appears as a diffuse glow over the horizon. More faint still, the disk of the Milky Way Galaxy becomes apparent as a dramatic diffuse band across the sky that seems to crash into the horizon far in the distance. In the foreground, a picturesque landscape includes trees, a lake, and a stone wall. Finally, on this serene night in July when the lake water was unusually clam, reflections appear. Visible in the lake are not only reflections of several bright stars, but part of the Milky Way band itself. Careful inspection of the image will reveal, however, that bright stars leave small trails in the lake reflections that do not appear in the sky above. The reason for this is because the above image is actually a digital composite of time-consecutive exposures from the same camera. In the first set of exposures, sky images were co-added with slight rotations to keep the stars in one place. |
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