For millions of years all life on earth -- plants, insects, mammals, fish, birds, amphibians and humans -- evolved with the diurnal cycles of day and night.

In the night, largely unseen by humans, life flourishes: animals mate, they pollinate plants, feed and live out their lives in the cover of darkness. Many plant species open their flowers only in the dark of night. And for almost all of history, humanity has shared the night sky: the thousands of visible stars, the constellations, the Milky Way and even faint, far-away galaxies. This has been a common heritage for all humans. Copy article link

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