If Algae Clings to Snow on This Volcano, Can It Grow on Other Desolate Worlds?

Scientists were surprised to find something living on the sterile heights of this Chilean volcano.

Lara Vimercati and Jack Darcy, two graduate students, at the edge of a penitente field on a Chilean volcano where researchers unexpectedly found algae.
Credit Steven K. Schmidt

 

 

In Chile’s Atacama Desert, Volcan Llullaillaco is Mars on Earth — or about as close to it as you can get. At 22,000 feet above sea level, it’s the second highest active volcano on Earth. Most of the mountain is a barren, red landscape of volcanic rock and dust, with thin, dry air, intense sunlight and winds that will blow your tent down the mountain.

While the ground can heat up to 90 degrees Fahrenheit, air temperatures rarely reach above freezing. When snow falls, it turns to gas just as it hits the earth. Occasionally, snow can collect in windblown banks, which then melt into icy spires up to 16 feet tall. The Spaniards called these “nieves penitentes,” penitent ones, because they look like hooded monks doing penance.

These conditions high up on the volcano made it seem about as lifeless as Mars. But a team of researchers led by Steven K. Schmidt, a microbiologist at the University of Colorado Boulder who studies extreme life, have discovered microbes living in and around the penitentes at 17,300 feet above sea level, about one thousand feet above the point at which vegetation stops on Volcan Llullaillaco.

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