BABAK TAFRESHI / SCIENCE PHOTO LIBRARY BABAK TAFRESHI / SCIENCE PHOTO LIBRARY
Starry night sky over the Licancabur volcano, on the border between Chile and Bolivia. Deneb, one of the brightest stars in Earth's sky, can be seen on the right, in the Cygnus constellation. In the foreground are ice penitentes: tall, thin blades of ice that form at high altitudes.
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