BABAK TAFRESHI / SCIENCE PHOTO LIBRARY BABAK TAFRESHI / SCIENCE PHOTO LIBRARY
Timelapse of the night sky over the Grand Canyon, Arizona, USA. The canyon is 446 kilometres long and is one of the seven natural wonders of the world. In the foreground to the right is the Desert View Watchtower, which was built in 1932. Towards the top, in the centre of the sky is the north star (Polaris).
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