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。

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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。

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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。

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The Solbot, made by startup QBotix, stops at each array and extends a cylindrical arm to adjust the angle of the photovoltaic panels so they capture the most amount of sun as it moves across the sky and through the seasons.

FORBES: How Robots Are Making Solar Power Cheaper