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What‚Äö?Ñ?¥s Next? Trees on Mars!07-30-07 | News

What?EUR??,,????'???s Next? Trees on Mars!




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On Pico Orizaba in Mexico, scientists are studying what makes trees refuse to grow above a certain point, where temperatures drop and the air becomes thinner, to see how easily they could grow on Mars.


Scientists are using the pine-forested slopes of Pico Orizaba, a dormant Mexican volcano, as a test bed to see if trees could grow on a heated-up Mars, part of a vision of making the chilly and barren red planet habitable for humans one day. Planetary scientists at NASA and Mexican universities believe if they can warm Mars using heat-trapping gases, raise the air pressure and start photosynthesis, they could create an atmosphere that would support oxygen-breathing life forms. Despite Mars’ lifeless rocky surface, burning ultra-violet radiation and its extremely thin, carbon dioxide-loaded air, humans have for long been obsessed with finding life there. Scientists believe Mars has ice at its polar caps that could melt into seas and that its subsoil contains the key elements needed for life.

The first human mission to Mars is seen 10 to 15 years away, and the warming-up process could start 50 years later, NASA scientist Chris McKay said. By pumping in highly insulating gases like methane or nitrous oxide, the scientists think they could heat Mars to 41 degrees Fahrenheit from minus 67 F now. That would match temperatures where trees grow at 13,780 feet on Pico de Orizaba.

Having trees on Mars, as opposed to only simple plant forms like algae or lichens, would open the possibility of humans one day being able to breathe Martian air.

“Things don’t really start cooking from a biological point of view until trees start growing. Trees are the engines of the biosphere,” McKay said. “It’s possible Mars could have trees in 100 years. (But first) we need to understand what sets the tree line on Earth.?EUR??,,????'??

Source: Reuters

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