Friday, December 18, 2009
Thursday, September 24, 2009
I've just finished listening to a NASA press conference announcing that nearly half of Mars has a layer of nearly pure ice just under its surface.
The NASA scientists estimate that this represents about one million cubic kilometers of ice, or about twice the amount of ice that covers Greenland here on Earth.
The Martian ice was exposed to view by meteorites that blasted out small craters--a few meters in diameter and from half a meter to two-and-a-half meters deep--and, much to the scientists' surprise, revealed a layer of 99 percent pure ice that they think ranges from 1 to 10 meters (33 feet) thick.
Three different instruments in orbit around Mars on the Mars Reconnaissance Orbiter allowed the scientists to detect five newly formed craters, photograph bright, bluish-white material in or splashed out around them, material that quickly faded away during the Martian summer, and finally identify that material as nearly pure water ice by its spectrum.
"We found a beautiful water ice signature," said Selby Cull, from the Compact Reconnaisance Imaging Spectrometer for Mars team. "Crystal-clear-no-doubt-about-it water ice."
The ice is amazingly recent--around 10,000 years old--the scientists say. It dates from a period when Mars was wetter and had much more water vapor in its atmosphere than it does today.
According to the researchers, the discovery sheds light on the recent climate history of Mars, during which water vapor has shuttled out from and back to the polar regions as the Martian climate has warmed and cooled due to changes in the amount of sunlight the planet receives.
This plus earlier studies have led scientists to conclude that Mars had far more water in the distant past--several billion years ago--but has cooled and dried out over time. Some of the water is now locked up in minerals, some has been lost to space, and some remains in the form of ice.
Mars is now too cold, and its atmosphere is too thin, to allow liquid water to exist at the surface. However, these new findings suggest that water may still percolate underground, coalescing to form these newly discovered underground ice sheets.
Ironically, the Viking II spacecraft landed in the region where this ice was found in 1976, and scraped down into the soil, but not quite deep enough to find the ice.
"If Viking II had been able to dig down a few more inches, we could have made this discovery 30 years ago," said Shane Byrne, with the High Resolution Imaging Science Experiment.
The NASA scientists say they were not surprised to find ice under the surface of Mars, but were amazed to find that it was so pure. "We expected it to be a 50-50 mix of ice and dust," Byrne said. This has sent them back to their blackboards to try to explain what they found.
It may be decades or even centuries before humans set foot on Mars. The good news is that when we do get there, there will be plenty of water waiting for us just under Mars' cold and dusty surface.
Robert Adler
for the institute
Monday, September 14, 2009
Saturday, July 11, 2009
Comment: No defense to torture
Robert Adler
for the institute
Friday, May 15, 2009
This is the second in a series of "Road Sign" commentaries designed to bring under-noticed events that may turn out to be of global significance to public attention.
Road Signs: Climate change
Kiss your coastline goodbye
Climate scientists have predicted for many years that rising sea levels caused by melting ice and warming oceans will threaten and eventually inundate low-lying islands and coastlines—including parts of Florida, the Eastern and Western seaboards of the U.S., and the Gulf coast.
Worldwide, large coastal cities, home to hundreds of millions of people, are at risk.
Residents of Pacific islands such as Kiribati have already seen the ocean erode beaches and kill crops, and have understandably been among the most vocal advocates for global action to slow human-caused climate change.
Now, however, the Carteret Islands off the coast of Papua New Guinea have become the unfortunate poster child for climate change. As reported in The Guardian/UK, the Carteret’s 2600 inhabitants are in the process of abandoning the island, their ancestral home, to the encroaching Pacific. They are being moved, five or ten families at a time, to Bougainville, also part of Papua New Guinea.
Given that millions of people have been displaced over the centuries because of floods, droughts and famines, the inhabitants of the Carterets are not the first climate-change refugees, nor even the first to be displaced by human activities—human-caused deforestation and desertification have been taking place for centuries.
They are, however, the first community who, as a whole, are being uprooted due to one of the predicted impacts of modern, man-made climate change.
Since atmospheric carbon dioxide levels are rising more rapidly than ever, ice in Antarctica and elsewhere is melting even faster than predicted, and atmospheric and oceanic warming are expected to create stronger and more destructive hurricanes and storm surges, the residents of the Carterets will definitely not be the last climate change refugees this century.
We ignore their plight at our peril.
Robert Adler
for the institute
Wednesday, May 13, 2009
This is the first in a series of "Road Sign" commentaries designed to bring under-noticed events that may turn out to be of global significance to public attention.
Road Signs: The Middle East
Recent largely unnoticed reports of what an Associated Press source labels an “unprecedented” public rebuke of Iranian President Ahmadinejad by the country’s supreme religious authority, Ayatollah Ali Khamenei, over a seemingly-minor domestic dispute, may, in fact, reflect a much more significant shift underway, not only in Iran’s political leadership but in its relations with the Western world.
With national elections scheduled for June 13, scarcely a month away, such public disapproval of one of Ahmadinejad’s actions by the ruling clerical authorities could well have a decisive effect in undermining the President’s remaining support within the Iranian power structure.
While the global economic downturn and consequent decrease in oil revenue have stirred public discontent, further tarnishing his public image, Ahmadinejad has, until this point, managed to retain the critical backing of Iran’s religious leadership. The current dispute over his dismissal of the chief official responsible for managing the Hajj and Pilgrimage Organization, important though it may be in an Iranian domestic context, potentially provides the ruling ayatollahs the opportunity to demonstrate a new flexibility in foreign relations—the area in which Ahmadinejad has played a particularly provocative and controversial role .
What has changed most notably in recent months is the foreign policy of the United States, with strong signals being sent by the Obama Administration that it is interested in pursuing a new relationship with Iran following more than a quarter-century of mutual hostility. In that context, Ahmadinejad, whatever his domestic virtues, is a definite liability, having positioned himself as an extreme hard-liner on relations not only with Israel—whose very legitimacy he has denied—but with the US and West whose values and policies he has repeatedly demeaned and attacked.
While the ayatollahs may share many of his opinions, and have clearly found it convenient to use him as a lightning-rod for international opprobrium, the diplomatic opening offered by the Obama Administration to initiate a new and less-rancorous relationship with the US and its Western allies may outweigh any lingering loyalty they may feel to Ahmadinejad himself. In short, he may have outlived his usefulness. And the upcoming election may provide the perfect opportunity to bring in new and less polarizing leadership.
Reading Iranian tea leaves is a notoriously difficult art, but in addition to this largely unreported public scolding of Ahmadinejad, two other recent events: the announcement by Hamas leader, Khaled Meshal, that the organization had stopped firing rockets at Israel for the time being; and the sudden release of Iranian-American journalist, Roxana Saberi, should be taken as serious signs that Iran is rethinking its options on multiple fronts, and carefully testing the temperature of the international waters.
In contrast to the previous events, however, Saberi’s case did capture public, media and diplomatic attention with both Secretary of State Hillary Clinton and President Obama denouncing the obviously trumped-up nature of the charges against her. While important, and a likely further signal of Iranian interest in pursuing better relations with the United States, the Saberi case should not be seen in isolation. Taken as one more step in the delicate diplomatic dance occurring between Iran and the United States, it is part of a much larger drama, which, if successful, may help defuse one of the world’s potentially most explosive situations.
Les Adler for The Institute
Monday, March 09, 2009
Monday, January 05, 2009
Economics—the infantile science
At the start of the 21st Century, it shouldn’t take a Nobel-Prize-winning mind to understand that all dynamic systems need regulation in order to function and last.
(Note March 10, 2009) As of the stock market close yesterday, the major indexes have lost over 25% of their value so far this year. So make that 55 stories gone; 45 to go. In the crash of 1929, the market pancaked to 10% of its pre-crash peak, and took until the 1950s to climb back to that level!
And, to make sure that the world’s markets and the people who run them act like grownups, regulate them, regulate them well, and enforce the damn rules, especially for the biggest players.