According to foreign media reports, tropical temperatures will reach 30 degrees Celsius, but 24 million years ago, the temperature was similar to the equatorial regions of the Arctic, keeping minus 40 degrees Celsius, the Earth is a complete "snowball."
This period is known as "Snowball Earth", the Earth may be completely frozen, while the second Europa and Titan Frozen Planet provide important clues to the search for life. The study was conducted by the University of Cologne, Germany Daniel - Hvar Benitez (Daniel Herwartz) Dr. responsibility, study the details published in a recent issue of "US National Academy of Sciences" on.
Research suggests that 2.4 billion years ago, the entire planet is in "deep freeze", the thickness of the sea ice up to 300 meters, which means that if the Earth was the existence of life, it is likely to survive under the ice. Other planets in the solar system there is also the surface of Europa and other icy crust, scientists believe there is a liquid ocean beneath the ice shell.
Hvar Benitez said: "These phenomena are very attractive, our planet had 2.4 billion years ago is a completely frozen world." At the same time, this theory helps to explain the 2.2 billion years ago, "oxygen-rich transitional period" At that time the atmospheric oxygen level rose to 21% from today's 0.0001%. Rapid melting caused the entire planet gradually increased atmospheric oxygen levels.
Hvar Benitez pointed out, 24 million years ago, Earth's climate is "normal", similar to the current climate. At the same time, he said, is likely to decline in the index of atmospheric carbon dioxide cause the Earth to become a "snowball", when the index fell carbon dioxide, ice will grow larger, because the ice is white, a large number of incident sunlight is reflected into space, then more multi-ice incident would reflect more sunlight, the earth gradually cooling. Climate models predict results show that when the temperature reaches a certain critical point, the Earth will be completely frozen. After much sunlight is reflected into space, the Earth becomes a complete "snowball."
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