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'Amazing Discovery On Mars'

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Mars Discovery: Dry Ice Lake Suggests Planet Used To Have Intense ‘Dust Bowl’ Climate

By ALICIA CHANG   04/21/11 03:35 PM ET  

 
 LOS ANGELES — Think Mars today is a hostile place? It was worse 600,000 years ago, according to new research that suggests the planet had a dustier, stormier atmosphere.

“It was an unpleasant place to hang out,” said lead researcher Roger Phillips of the Southwest Research Institute. He said Mars’ climate was probably a lot like the American Dust Bowl of the 1930s – but a lot worse.

The evidence comes from the discovery of a huge underground reservoir of dry ice, or frozen carbon dioxide, at its south pole – much more than scientists realized. They suspect some of that store of carbon dioxide was once in Mars’ atmosphere, making it denser.

In the recent geologic past, when Mars’ axis tilted, sunlight reached the southern polar cap, melting some of the frozen carbon dioxide. This release would have made the atmosphere thicker and caused more dust to loft into the air, creating severe storms. Other times, carbon dioxide cycled back into the ground as part of a seasonal cycle.

There is an upside to that stormier climate: The thicker atmosphere back then meant there were more regions on the planet where liquid water probably existed. Water is considered an essential ingredient for life.

Still, “it was not the balmy, tropical Mars” that existed even billions of years earlier, Phillips said.

Mars today is frigid, arid and constantly bombarded by lethal radiation. Its atmosphere, made up mostly of carbon dioxide, is many times thinner than the top of Mount Everest on Earth. In fact, the Martian atmosphere is less than 1 percent of Earth’s.

The red planet wasn’t always this unforgiving. A maze of gullies, canyons and river channels on the surface points to a warmer and wetter past very early in the planet’s history.

The underground dry ice deposit, roughly the size of Lake Superior, was discovered using ground-piercing radar aboard the NASA Mars Reconnaissance Orbiter designed to probe below the crust. Researchers estimate it represents 30 times more carbon dioxide than previously believed. Its presence may help explain how most of the Martian atmosphere disappeared.           NASA issues warning of solar superstorm 2012

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    Total 5 comments
    • Redoubt

      The longer we look at this planet, the less boring it becomes, lol!

      This should be a lesson to modern science as well as the global warming mob. Planetary norms may not become apparent right away. Natural, cyclical changes that only come about after tens, if not hundreds of thousands of years can be easily missed or misidentified.

    • HDThoreau

      We’re fish in a bowl guessing at who arranged the furniture in another room. Hopefully the more the primates poke and prod at Mars, the more their perspective will start to approach reality.

    • Holy Ghost in the Machine

      @HDTHoreau That was a great metaphor!

    • Mookie Bonging

      Evidently the EPA was a bit late in getting there. Where is Al Gore when you need him?

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