Daily Archives: August 22, 2011

Views from the Solar System



SPACE WATCH

Ophir Chasma
NASA – During its examination of Mars, the Viking 1 spacecraft returned images of Valles Marineris, a huge canyon system 5,000 km, or about 3,106 miles, long, whose connected chasma or valleys may have formed from a combination of erosional collapse and structural activity. This synthetic oblique view shows Ophir Chasma, the northern most one of the connected valleys of Valles Marineris. For scale, the large impact crater in lower right corner is about 18.5 miles, or 30 km, wide.

Ophir Chasma is a large west-northwest-trending trough about 62 miles, or 100 km, wide. The Chasma is bordered by high-walled cliffs, most likely faults, that show spur-and-gully morphology and smooth sections. The walls have been dissected by landslides forming reentrants. The volume of the landslide debris is more than 1,000 times greater than that from the May 18, 1980, debris avalanche from Mount St. Helens. The longitudinal grooves seen in the foreground are thought to be due to differential shear and lateral spreading at high velocities. Image Credit: NASA/JPL/USGS

Vesta Sizes Up
This composite image shows the comparative sizes of nine asteroids. Up until now, Lutetia, with a diameter of 81 miles (130 kilometers), was the largest asteroid visited by a spacecraft, which occurred during a flyby. Vesta dwarfs all other small bodies in this image.

Asteroid Vesta also is considered a protoplanet because it’s a large body that almost became a planet and has a diameter of approximately 330 miles (530 kilometers). Image Credit: NASA/JPL-Caltech/JAXA/ESA

This Is What the Moon Looks Like From Space
On Sunday, July 31, 2011, when Expedition 28 astronaut Ron Garan aboard the International Space Station looked out his window, this is what he saw: the moon. And, he saw it 16 times. Said Garan, “We had simultaneous sunsets and moonsets.” For Garan and the rest of the station crew, this extraordinary event is a daily occurrence. Since the station orbits the Earth every 90 minutes, each day the crew experiences this about 16 times a day.

Long Way From Home
This picture of a crescent-shaped Earth and Moon — the first of its kind ever taken by a spacecraft — was recorded Sept. 18, 1977, by NASA’s Voyager 2 when it was 7.25 million miles (11.66 million kilometers) from Earth. Voyager 2 was launched on Aug. 20, 1977, 16 days before its twin, Voyager 1.

This photo was made from three images taken through color filters, then processed at NASA’s Jet Propulsion Laboratory. Because the Earth is many times brighter than the moon, the moon was artificially brightened so that both bodies would show clearly in the prints.

Opportunity’s Heat Shield
This image from 2005 shows the remains of the heat shield from NASA’s Mars Exploration Rover Opportunity, broken into two key pieces, the main piece on the left side and a broken-off flank piece near the middle of the image. The heat shield impact site is identified by the circle of red dust on the right side of the picture. In this view, Opportunity is approximately 66 feet (20 meters) from the heat shield, which protected it while hurtling through the Martian atmosphere.

In the far left of the image, a meteorite called ‘Heat Shield Rock’ sits nearby, as the sun reflected off the silver-colored underside of the internal thermal blankets of the heat shield. The rover spent 36 sols investigating how the severe heating during entry through the atmosphere affected the heat shield. The most obvious is the fact that the heat shield inverted upon impact.

This is an approximately true-color rendering of the scene acquired around 1:22 p.m. local solar time on Opportunity sol 324 (Dec. 21, 2004) in an image mosaic using panoramic filters at wavelengths of 750, 530, and 430 nanometers. Opportunity has now spent more than 2,680 sols, or Martian days, on the Red Planet. Image Credit: NASA/JPL/Cornell

Opportunity’s View of the Rim of Endeavour
NASA’s Mars Exploration Rover Opportunity used its panoramic camera to capture this view of Endeavour Crater’s rim after a drive during the rover’s 2,676th Martian day, or sol, of working on Mars (Aug. 4, 2011). The drive covered 396 feet (120.7 meters) and put the rover with about that much distance to go before reaching the chosen arrival site at the rim, called ‘Spirit Point.’

Endeavour Crater has been the rover team’s destination for Opportunity since the rover finished exploring Victoria crater in August 2008. Endeavour, with a diameter of about 14 miles (22 kilometers), offers access to older geological deposits than any Opportunity has seen before. This view looks toward a portion of the rim south of Spirit Point, including terrain that Opportunity may explore in the future. Image Credit: NASA/JPL-Caltech/Cornell/ASU

Close-up View of ‘Snowman’ Craters
A set of three craters, nicknamed “Snowman,” are seen in this image of the northern hemisphere of Vesta. This image was obtained by the framing camera on NASA’s Dawn spacecraft on July 24, 2011 from a distance of about 3,200 miles (5,200 kilometers). Image credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA

Rock Layers in Gale Crater
This oblique view of the lower mound in Gale Crater shows layers of rock that preserve a record of environments on Mars. Here, orbiting instruments have detected signatures of both clay minerals and sulfate salts, with more clay minerals apparent in the foreground of this image and fewer in higher layers. This change in mineralogy may reflect a change in the ancient environment in Gale Crater.

Mars scientists have several important hypotheses about how these minerals may reflect changes in the amount of water on the surface of Mars. The Mars Science Laboratory rover, Curiosity, will use its full suite of instruments to study these minerals to provide insights into these ancient Martian environments. These rocks are also a prime target in the search for organic molecules since these past environments may have been habitable — able to support microbial life. Scientists will study how organic molecules, if present, vary with mineralogical variations in the layers to understand how they formed and what influences their preservation.

The smaller hills in this view may provide clues to the modern water cycle on Mars. They contain sulfate salts that have water in them, and as temperatures warm into summer, some of that water may be released to the atmosphere. As temperatures cool, they may absorb water from the atmosphere. The Mars Science Laboratory team will investigate how water is exchanged between these minerals and the atmosphere, helping us understand Mars’ modern climate. The hills are particularly useful for this investigation because different parts of the hills are exposed to different amounts of sunlight and thus to different temperatures. Curiosity will be able to compare the water in these contrasting areas as part of its investigations.

This three-dimensional perspective view was created using visible-light imaging by the High Resolution Imaging Science Experiment camera on NASA’s Mars Reconnaissance Orbiter and the High Resolution Stereo Camera on the European Space Agency’s Mars Express orbiter. Three-dimensional information was derived by stereo analysis of image pairs. The vertical dimension is not exaggerated. Color information is derived from color imaging of portions of the scene by the High Resolution Imaging Science Experiment camera.

The Mars Science Laboratory spacecraft is being prepared for launch on Nov. 25, 2011. In a prime mission lasting one Martian year — nearly two Earth years — after landing, researchers will use the rover’s tools to study whether the landing region has had environmental conditions favorable for supporting microbial life and for preserving clues about whether life existed. Image Credit: NASA/JPL-Caltech/University of Arizona

The gamification of the presidential election


By Dominic Basulto – The White House, which includes staff from the 2008 campaign that pioneered the grassroots use of social media for presidential elections, signed up for the geo-location social network Foursquare. Participation on this network, which has attracted millions of users and is usually held up as the poster child for the “Gamification” trend, is being presented as a way for Obama to become more accountable to the electorate. But will it work?

When the concept of “gamification” entered the mainstream last year via a hugely popular video, there was talk that this “Game Layer” would soon be applied to every facet of our lives. Since that time, game mechanics, which tap into our inner psychology and apply the right behavioral triggers at the right time to inspire action, have been embraced by brands, celebrities, TV shows and media companies, so it was only a matter of time before a political celebrity like President Obama would embrace this game concept as well. more> http://tinyurl.com/452u839

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The Wrong War: The Insistence on Applying Cold War Metaphors to Cybersecurity Is Misplaced and Counterproductive


By Peter W. Singer and Noah Shachtman – For every big policy issue, there’s usually a parallel that can be found in the past. As Mark Twain once put it, “History does not repeat itself, but it does rhyme.”

The problem is that the song is not the same and the historic fit to the Cold War is actually not so neat. Cyberspace is a man-made domain of technological commerce and communication, not a geographical chessboard of competing alliances. The Cold War was a competition primarily between two superpowers, with political leadership and decision-making clearly located in Washington and Moscow, each the center of a network of allied treaties and client states, and a Third World zone over which they competed. By contrast, the Internet isn’t a network of governments, but the digital activities of 2 billion users, traveling across a network owned by an array of businesses, mostly 5,039 Internet service providers, that rely almost exclusively on handshake agreements to carry data from one side of the planet to the other, according to Bill Woodcock and Vijay Adhikari in their article “Survey of Characteristics of Internet Carrier Interconnection Agreements (pdf)” from Packet Clearing House. The Cold War also was a war of ideas between two competing political ideologies. more> http://tinyurl.com/42otfe5

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Storing Wind Energy as Hydrogen


By David Anthony and Ken Brown – Water electrolysis produces hydrogen. In a 100% efficient unit, it takes about 39 kilowatt hours (kWh) of electricity to create 1 kilogram (kg) of hydrogen. In the real world, electrolysis units are about 80% efficient at best. With an 80% efficient unit, it takes about 50 kWh of electricity to create 1 kg of hydrogen. The hydrogen is piped to a hydrogen storage unit. To avoid the high cost of compressing hydrogen or of cooling and liquefying hydrogen, a good alternative is to store the gas in a metal hydride slurry. Safe Hydrogen uses magnesium as the metal and mineral oil as the liquefying agent. With the use of small particles and a suitable dispersant, the particles will stay in suspension almost indefinitely. Using a hydriding reactor, hydrogen is absorbed by the Magnesium Slurry with suitable pressure and temperature that ensures rapid reaction. The Magnesium Hydride Slurry that is created in this reactor then can be stored in large quantities at ambient conditions. more> http://tinyurl.com/44ry9oo

High tech’s patented self-serving maneuvers


By Steven Pearlstein – Silly me. I thought the purpose of patents was to spur innovation by giving people who invent something the exclusive use of their innovation for a limited time.

There’s still some of that. But out in Silicon Valley, patents have become the competitive weapon of choice, used by high-tech giants to bludgeon rivals and crush upstarts.

Instead of spurring innovation and entrepreneurship, patents are being used by companies, venture capitalists and their cynical lawyers to stifle and discourage them. more> http://tinyurl.com/3nuvmgx

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