15 years, 10 months ago

Astronauts Spot Mysterious Ice Circles in World's Deepest Lake

Astronauts aboard the International Space Station noticed two mysterious dark circles in the ice of Russia's Lake Baikal in April. The two circles are the focal points for ice break-up and may be caused by upwelling of warmer water in the lake. Upwelling wouldn't be strange in some relatively shallow areas of the lake where hydrothermal activity has been detected, such as where the circle near the center of the lake is located. But the location of the circle near the southern tip of the lake where water is relatively deep and cold is puzzling.

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Lake Mysterious Ice

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