A volcanic lake -- bright blue and full of toxic metals -- reveals how life may have been possible on ancient Mars.
Sign up for CNN's Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Near the summit of Costa Rica's Poás volcano is one of Earth's most acidic lakes, bright blue and full of toxic metals.
The harsh conditions of Laguna Caliente, where temperatures can fluctuate between 100 degrees Fahrenheit and 194 degrees Fahrenheit , are where a few lucky scientists go to learn more about Mars. Frequent phreatic eruptions occur when groundwater is heated by volcanic activity, releasing explosions of ash, rock and steam.
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