Saturday, May 16, 2009

Rivers might have flowed recently on Mars : Study!!

A new study has indicated that rivers might have flowed recently on the planet Mars.

The study has found some serious valleys carved by rivers within the last billion years, which is much sooner than most similar findings.

That's good news for biologists, as water is a key to life as we know it, and the more recently there was liquid water on Mars, the greater the chances for life to have arisen and endured.

Jay ****son of Brown University and his colleagues found valleys more than 800 feet wide (250 meters) and tens of miles (kilometers) long in new images from the Mars Reconnaissance Orbiter.

The valleys look as though they were carved by running water.

"We believe that these new valleys were formed within the last billion years, which is quite recent when you view it in the geologic history of water on Mars," ****son told
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Researchers have been finding evidence for water flowing more recently.

In March, scientists said a system of gullies they studied suggest water flowed just 1.25 million years ago, at least in relatively small quantities.

****son and his colleagues found within a crater called Lyot some 20 winding valleys that they think were carved by "relatively large amounts of water," all in a surface dated to about 1 billion years ago, which means that the rivers must have formed since then.

"Evidence for life might be better preserved in a younger terrain like what we have found, as opposed to the ancient terrain that was once wet, but has been significantly buried or eroded over 4 billion years," ****son said.

The source of the runoff is thought to have been near-surface ice that melted.

Dust-covered glaciers appear to still exist at the site, which is in the northern hemisphere of Mars.

"The interior of Lyot crater is an optimal micro-environment, since its low elevation leads to high surface pressure, and temperature conditions at its location in the northern mid-latitudes are sufficient for melting during periods of high-obliquity," according to the researchers.

"This micro-environment in Lyot apparently allowed melting of surface ice and the formation of the youngest fluvial valley systems of this scale yet observed on Mars," they added.

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