The dark clouds in the sky meant that a storm was coming.

天空中的乌云预示暴风雨即将来临。

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In most cities the sky looks as though it has been emptied of stars, leaving behind a vacant haze that mirrors our fear of the dark.

在大多数城市里，天上看起来好像没有星星，仅剩一层薄薄的雾霾，这反映出我们对黑暗的恐惧。

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When the sky suddenly turns dark and the wind is strong, watch out! A dangerous storm might be coming.

当天色突然变黑且狂风大作的时候，要小心！一场危险的暴风雨可能要来了。

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Max Arthur Cohn's painting "Coal Tower" shows the dark form of a coal tower against a light sky.

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"I certainly enjoy going to the desert and just seeing the sky from a dark location, " he said.

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The criteria for a dark sky site includes that the Milky Way is visible to the naked eye.

BBC: Stargazing live: Astronomers stage Isle of Man events

"You can no longer just take a short drive from the city and look at the Milky Way or the northern lights, " says Chad Moore, a board director for the International Dark-Sky Association, a Tucson-based nonprofit organization.

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