Pleiades: The Seven Sisters

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Water On Mars

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Mars is unlikely to sport beachfront property anytime soon, but the planet has enough water ice at its south pole to blanket the entire planet in more than 30 feet of water if everything thawed out.

With a radar technique, astronomers have penetrated for the first time about 2.5 miles (nearly four kilometers) beneath the south pole's frozen surface. The data showed that nearly pure water ice lies beneath.

Discovered in the early 1970s, layered deposits of ice and dust cap the North and South Poles of Mars. Until now, the deposits have been difficult to study closely with existing telescopes and satellites. The current advance comes from a probe of the deposits using an instrument aboard the Mars Express orbiter.

"This is the first time that a ground-penetrating system has ever been used on Mars," said the new radar study's lead author, Jeffrey Plaut of NASA's Jet Propulsion Laboratory. "All the other instruments used to study the surface of Mars in the past really have only been sensitive to what occurs at the very surface."

(NASA's Mars Odyssey spacecraft also carries instruments designed, among other things, to probe beneath icy polar surfaces.)

Deep probe

Plaut and his colleagues probed the deposits with radar echo sounding, typically used on Earth to study the interiors of glaciers. The instrument, called the Mars Advanced Radar for Subsurface and Ionospheric Sounding, or MARSIS, beams radio waves which penetrate the planet's surface and bounce off features having different electrical properties.

The reflected beams revealed that 90 percent or more of the frozen polar material is pure water ice, sprinkled with dust particles. The scientists calculated that the water would form a 36-foot-deep ocean of sorts if spread over the Martian globe.

One Photo - 10,000 Galaxies

Take a look...as far back in time as human eyes have ever seen. Some of these galaxies are over 13 Billion light years away, dating to a time when the Universe was a mere 700 million years old. This tiny patch of (seemingly empty) space when viewed by Hubble for a million seconds reveals 10,000 galaxies. How many galaxies do you imagine there are in total in the physical universe?

No Arms Race In Space

From an article in the Washington Post today

...there isn't an arms race in space...because no one else has the capability of racing there but the US...

Bush Sets Defense As Space Priority
U.S. Says Shift Is Not A Step Toward Arms; Experts Say It Could Be

President Bush has signed a new National Space Policy that rejects future arms-control agreements that might limit U.S. flexibility in space and asserts a right to deny access to space to anyone "hostile to U.S. interests."

The document, the first full revision of overall space policy in 10 years, emphasizes security issues, encourages private enterprise in space, and characterizes the role of U.S. space diplomacy largely in terms of persuading other nations to support U.S. policy.

"Freedom of action in space is as important to the United States as air power and sea power," the policy asserts in its introduction.

National Security Council spokesman Frederick Jones said in written comments that an update was needed to "reflect the fact that space has become an even more important component of U.S. economic, national and homeland security." The military has become increasingly dependent on satellite communication and navigation, as have providers of cellphones, personal navigation devices and even ATMs.

The administration said the policy revisions are not a prelude to introducing weapons systems into Earth orbit. "This policy is not about developing or deploying weapons in space. Period," said a senior administration official who was not authorized to speak on the record.

Nevertheless, Michael Krepon, co-founder of the Henry L. Stimson Center, a nonpartisan think tank that follows the space-weaponry issue, said the policy changes will reinforce international suspicions that the United States may seek to develop, test and deploy space weapons. The concerns are amplified, he said, by the administration's refusal to enter negotiations or even less formal discussions on the subject.

"The Clinton policy opened the door to developing space weapons, but that administration never did anything about it," Krepon said. "The Bush policy now goes further."

Theresa Hitchens, director of the nonpartisan Center for Defense Information in Washington, said that the new policy "kicks the door a little more open to a space-war fighting strategy" and has a "very unilateral tone to it."

The administration official strongly disagreed with that characterization, saying the policy encourages international diplomacy and cooperation. But he said the document also makes clear the U.S. position: that no new arms-control agreements are needed because there is no space arms race.