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November 28, 2007
Venus, Once a Twin of Earth, Now Devoid of Water
4.5 million years ago, both Venus and Earth were formed with nearly the same radius, mass, density and chemical composition. So, what happened since then?
The European Space Agency's Venus Express, which has been orbiting the planet since April last year, has discovered that Venus is more Earth-like than once thought, as reported by Hakan Svedhem, a European Space Agency scientist and the lead author of the study published today in the journal Nature.
Svedhem believes that Venus may have been partially covered with water before it became doomed by global warming.
"Probably because Venus was closer to the sun, the atmosphere was a little bit warmer and you got more water very high up," he said.
Even today, Earth and Venus have roughly the same amount of CO2. But whereas most of Earth's store remains locked in the soil, rocks and oceans, on Venus the extreme heat pushed the gas into the air.
"You wound up with what we call a runaway greenhouse effect," Mr Svedhem said.
So much for those that still think global warming is an overblown concept. Simply look to our "twin" neighbor in the universe to see what greenhouse gases can do over time, as reported by Agence France-Presse, and published by The Sydney Morning Herald.
Posted by Stephen Betheil at November 28, 2007 11:20 AM
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