Urban light pollution is a danger for marine ecosystems

Cities are artificially lit to allow humans to make use of the night. This light pollution means that stars are often barely visible in urban skies. But reduced stargazing is not the only impact of artificial light at night.

EXPLAINER: When is Manhattanhenge? Where can you see it?

Didn't make it to Stonehenge for the solstice? There might still be time to catch Manhattanhenge, when the setting sun aligns with the Manhattan street grid and bathes the urban canyons in a rosy glow.

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