Huge Dust Storm Breaks Out on Mars

By: Dave Mosher

A major dust storm has developed on the red planet, blocking sunlight and prompting Mars mission managers to keep a close eye on it, SPACE.com has learned.

It is not known how large the storm might grow, but already it is thousands of miles across. If it balloons, as dust storms have done in the past, it could hamper operations of NASA's Mars rovers Spirit and Opportunity.

For now, officials don't think the storm will threaten rover operations, however. In fact, the windy conditions on the planet have blown off large amounts of dust from the rovers' solar arrays, giving them more power. The power boost may lend a helping hand to the Opportunity rover, should officials decide to send it into Victoria Crater.

"We've been watching this storm for about six days now," said Steven Squyres of Cornell University, who is the lead scientist of the Mars Exploration Rover Project. "It's not unheard of for Martian dust storms to cover half the planet, and this one is now a regional storm."

Squyres wasn't certain of the storm's exact size, but said it appears to be thousands of miles in diameter and "ain't no little hurricane." In fact, "it's one of the most sunlight-blocking storms we've seen on Mars," he said.

According to reports from the Mars Reconnaissance Orbiter, which Squyres deemed as Mars' weather satellite, the storm has grown in size and is lifting up dust about 560 miles (900 KM) east of Opportunity, which is presently at Meridiani Planum. "The Mars Reconnaissance Orbiter team is watching this closely, because we worry about dust in the atmosphere obscuring the sunlight," Squyres said.

Experienced amateur astronomers have spotted the storm with large telescopes. Paul Maxson of Phoenix, Arizona, was one of the first to image the storm.

Dust storms on Mars occur regularly, but seldom do they grow beyond regional proportions. A storm in 2001, however, engulfed the entire planet in red dust.

"If the storm continues to get worse, it could cut into our activities," Squyres said. One of those activities, should the team decide it's not too risky, could be the descent of Opportunity into the massive Victoria Crater. A press conference is planned for Thursday to discuss the decision.

"The upshot of all this wind is that the arrays are so clean that the dust is insignificant right now," he said. "But this is Mars, and we can't predict the weather-we can only to react to it."

Diana Blaney, the deputy project manager for the Mars exploration rovers at NASA's Jet Propulsion Laboratory (JPL) in Pasadena, California, said dust levels can significantly impact the rovers' missions. "When big dust storms like this come along, they decrease the energy the rovers can work with," Blaney said.

JPL spokesperson Guy Webster said Mars mission managers will be monitoring the storm's progress and how it may affect the planned descent into the crater. "They've really been paying attention to the storm and been getting regular reports of its progress," Webster said.

Chicken Bones Suggest Polynesians Found Americas Before Columbus !

Source LiveScience.com
Popular history, and a familiar rhyme about Christopher Columbus, holds that Europeans made contact with the Americas in 1492, with some arguing that the explorer and his crew were the first outsiders to reach the New World.

But chicken bones recently unearthed on the coast of Chile—dating prior to Columbus’ “discovery” of America and resembling the DNA of a fowl species native to Polynesia—may challenge that notion, researchers say.

“Chickens could not have gotten to South America on their own—they had to be taken by humans,” said anthropologist Lisa Matisoo-Smith from the University of Auckland, New Zealand.

Polynesians made contact with the west coast of South America as much as a century before any Spanish conquistadors, her findings imply.

DNA in bone

The chicken bones were discovered at an archaeological site called El Arenal, on the south coast of Chile, alongside other materials belonging to the indigenous population. While chickens aren’t native to the region, it was believed the local Araucana species found there now was brought to the Americas by Spanish settlers around 1500.

Tests on the bones, however, now indicate the birds arrived well before any European made landfall in South America, Matisoo-Smith and her colleague Alice Storey found.

“We had the chicken bone directly dated by radio carbon. The calibrated date was clearly prior to 1492,” Matisoo-Smith told LiveScience, noting that it could have ranged anywhere from 1304 to 1424. “This also fits with the other dates obtained from the site (on other materials), and it fits with the cultural period of the site.”

Did Polynesians continue eastwards?

DNA extracted from the bones also matched closely with a Polynesian breed of chicken, rather than any chickens found in Europe.

Polynesia was settled by sailors who migrated from mainland Southeast Asia, beginning about 3,000 years ago. They continued gradually eastwards, but were never thought to have journeyed further than Easter Island, about 2,000 miles off the coast of continental Chile.

The chicken DNA suggests at least one group did make the harrowing journey across the remaining stretch of Pacific, Matisoo-Smith said.

“We cannot say exactly which island the voyage came from. The DNA sequence is found in chickens from Tonga, Samoa, Niue, Easter Island and Hawaii,” Matisoo-Smith said. “If we had to guess, we would say it was unlikely to have come from West Polynesia and most likely to have come from Easter Island or some other East Polynesian source that we have not yet sampled.”

The results are detailed in the latest issue of the journal Proceedings of the National Academy of Sciences.

Kon-Tiki trip in reverse

It might be the most tangible, but this isn’t the first evidence that pre-Columbian voyages from the Pacific to South America were possible.

In 1947, Thor Heyerdahl, the famous Norwegian anthropologist, made the voyage from Peru to Polynesia aboard his Kon-Tiki raft to prove the trip was doable with a rudimentary vessel.

There are more scientific arguments, too, said Matisoo-Smith.

“There is increasing evidence of multiple contacts with the Americas,” she said, “based on linguistic evidence and similarities in fish hook styles.” Physical evidence of human DNA from Polynesia has yet to be found in South America, she added.