The daytime quality of light in forests varies with the density of the vegetation, the angle of the Sun, and the amount of cloud in the sky.
森林里的日光质量随着植被密度、太阳照射角度和天空云层数量变化而变化。
Pictured above, a wide Angle, deep field image of the Cat's Paw nebula was culled from the second Digitized Sky Survey.
上而的猫爪星云的广角深空照片是从第二次数字化巡天中挑出来的。
The Virgo Cluster is so close that it spans more than 5 degrees on the sky - about 10 times the angle made by a full Moon.
室女座星系团距离我们如此之近，以至于它在天空中覆盖了5度多的天区――大小约是满月的10倍。
The wide-angle sky screen can be used for measuring the terminal velocity of the projectile, and providing synchronous signal for other trajectory measurement apparatus as the trigger device of the .
该装置可以用来测试弹丸末速，作为较大靶面的触发装置，为其他弹道测试仪器提供同步信号。
But the above wide Angle sky image captured even more sky wonders. What other nebulas can you find in the above image?
这张广角照片中还有更多奇景，你还能找到其他星云吗？
But the above wide Angle sky image captured even more sky wonders. What other nebulas can you find in the above image?
这张广角照片中还有更多奇景，你还能找到其他星云吗？
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