Valley of the Penitents: Big Pic

penitents, Atacama desert — These jagged formations of ice are found only in high, dry locales. The photo above was taken along the side of the road that leads to ALMA by Babak Tafreshi, one of ESO's Photo Ambassadors.

(Image credit: ESO/B. Tafreshi)

Oct. 1, 2012 -- Under the gaze of the majestic Licancabur volcano, Chile's Chajnantor Plateau hosts a congregation of frozen penitentes -- jagged formations of ice that are found only in such high, dry locales.

At an altitude of about 5000 meters above sea level, the Chajnantor Plateau in Chile's Atacama Desert is one of the driest places on Earth. It's for this reason that it was chosen as the site for the Atacama Large Millimeter/submillimeter Array (ALMA) observatory, since less moisture in the air makes for clearer, more stable and more precise observations of the distant universe.

Latest Videos From

Watch full video here:

Such an incredibly arid environment is also the cause of the penitentes, so named because of their resemblance to the white, pointed hats of the nazarenos, members of a brotherhood that hold annual Easter processions worldwide. It's thought that the ice deposits sublimate directly into the moisture-starved air, shaping around any surface variations and eventually forming a forest of hard, jagged structures anywhere from a few inches to 16 feet (5 meters) in height.