Jump to March 2012 archive page: 1 2 3
  • Satellites see what sprawls in Vegas

    In honor of Landsat 5's birthday, NASA shows how Las Vegas has grown since 1972.

    What sprawls in Vegas doesn't stay in Vegas. Time-lapse images from the Landsat series of Earth-monitoring satellites reveal in false-color, multispectral imagery how urban sprawl has stretched out from Nevada's "Sin City" over the past four decades. This latest video was posted by NASA in honor of the 28th anniversary of Landsat 5's launch on March 1, but the pictures actually go back to 1972, when the Landsat program began. Such images help planners keep track of the pace of development, which may affect future water use, zoning regulations and other policies. Want to see how your own area has changed between 1975 and 2000? Check out this "ChangeMatters" viewer from ESRI.

    More cool views from Landsat:



    Alan Boyle is msnbc.com's science editor. Connect with the Cosmic Log community by "liking" the log's Facebook page, following @b0yle on Twitter and adding the Cosmic Log page to your Google+ presence. You can also check out "The Case for Pluto," my book about the controversial dwarf planet and the search for new worlds.

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  • Robo-cheetah sets speed record

    This DARPA video shows a demonstration of the "Cheetah" robot galloping at speeds of up to 18 mph.




    If there's anything scarier than a cheetah coming after you, it would have to be a headless robo-cheetah coming after you at record speed. That nightmare is now a reality, thanks to DARPA's Cheetah robot, whose 18 mph pace has set a land speed record for machines with legs.

    The feat, revealed today on the Defense Advanced Research Projects Agency's website, is aimed at developing combat robots that can outrun and evade humans on foot — and a 3:20 mile should just about do it. (The world record for humans is 3:43.) Boston Dynamics has been working on the cheetah-bot as part of DARPA's Maximum Mobility and Manipulation program, or M3.


    "This robot is galloping," Boston Dynamics President Marc Raibert told the Boston Globe. "It's the first time we've had a robot that gallops."

    The previous record for legged robots was 13.1 mph, set in 1989 by the MIT Leg Lab's stick-figurish Planar Biped robot. For what it's worth, flesh-and-blood cheetahs can still run much faster, zooming at up to 70 mph.

    Boston Dynamics' headless Cheetah robot is just one of a menagerie of robots that are designed to take advantage of the biomechanics used by real-life creatures, ranging from fish to hummingbirds to, um, dogs. Boston Dynamics happens to be the same company that's been working on the BigDog and LS3 robots, which are also being developed for military applications (and are just as headlessly scary to behold).

    If that's not yet scary enough for you, Boston Dynamics is building a humanlike robot code-named Atlas, which will be capable of walking and jogging upright, squeezing through narrow alleyways and grabbing things with its two robotic arms — once again, without a head.

    The company says that in addition to the military applications, the robots can be used for humanitarian purposes such as emergency rescue and disaster response. Sure they can. I bet that's what they said about Skynet, too.

    More about biomimetic robots:


    Alan Boyle is msnbc.com's science editor. Connect with the Cosmic Log community by "liking" the log's Facebook page, following @b0yle on Twitter and adding the Cosmic Log page to your Google+ presence. You can also check out "The Case for Pluto," my book about the controversial dwarf planet and the search for new worlds.

  • Deep thinkers take center stage

    Video introduces "The City 2.0," the initiative that won this year's TED Prize.




    The annual TED conference brings thinkers and doers from around the world to Long Beach, Calif., to mingle and take part in a cornucopia of 18-minute lectures and other audiovisual delights. The program focuses on technology, entertainment and design (hence the acronym TED) but it takes in virtually any area of deep thought you can, um, think of.

    Each year, TED awards $100,000 prizes for great ideas that could use a little help. One example is the search for extraterrestrial intelligence, which received support in 2009 in the form of a TED Prize to the SETI Institute's Jill Tarter. Just this week, the SETI Institute kicked off a new program called SETI Live, aimed at supplementing the 13-year-old SETI @ Home computer-based search by enlisting living, breathing humans to review radio data.

    At this week's TED conference, the big winner was a concept, not a person: The City 2.0, a crowdsourcing clearinghouse that's backed by the Knight Foundation. The City 2.0 is designed to enable citizens to propose ideas to upgrade their own cities, and put them in touch with the resources that can turn those ideas into realities. The TED Prize was announced last December, but details about how the $100,000 in prize money were laid out for the first time during this week's conference. This June, the money will be awarded in $10,000 chunks to the 10 local projects that are judged "most likely to spur the creation of their City 2.0."

    Video from some of the other TED events have already been posted to the Web. Check out the music-playing robo-copters that were featured during a TED talk by University of Pennsylvania roboticist Vijay Kumar, and then take a look at these other clips:


    X Prize co-founder Peter Diamandis makes his case for the view that we're in an age of abundance.

    Environmentalist-entrepreneur Paul Gilding does a reality check on techno-optimism.

    Susan Cain, author of "Quiet: The Power of Introverts," talks about being an introvert in an extroverted age.

    In addition to the online lectures, TED attendees were treated to a variety of treats, including a project to turn their genomes into a symphony, a "second-a-day" video project and a batch of virtual-reality cyber-illusions. To get a feel for the fun, check out this trio of videos — and for more, take a spin through the TED Blog.

    TED attendees provided genetic samples that were processed overnight at Genentech, to produce a "genetic symphony" based on genetic markers. For more about the project, check out the Infinite Variations website as well as this webpage at the Personal Genome Project.

    During his TED2012 talk, Cesar Kuriyama showed off "One Second Everyday - Age 30" from Vimeo.

    Marco Tempest entertained the TED crowd with a new batch of cyber-illusions. Here's a shorter show-and-tell that Tempest presented last July at TEDGlobal.

    Finally, here's a way-too-spooky video from the future: A clip of techno-industrialist Peter Weyland's talk at TED2023, put together to promote "Prometheus," the soon-to-be-released semi-prequel to the "Alien" movie series. Feel the hubris:

    Peter Weyland (Guy Pearce) gives a talk at TED2023 in a clip created to preview the movie "Prometheus."

    More video to while away the minutes:


    Alan Boyle is msnbc.com's science editor. Connect with the Cosmic Log community by "liking" the log's Facebook page, following @b0yle on Twitter and adding the Cosmic Log page to your Google+ presence. You can also check out "The Case for Pluto," my book about the controversial dwarf planet and the search for new worlds.

  • Huge tornado spawns mini-twisters

    Video clips from storm chasers document a destructive tornado as it touches down in Indiana near Henryville. Subvortices can be seen spinning off the main funnel. (Via The Associated Press)




    The tornado that devastated southern Indiana today may have shared some deadly twists with a similarly powerful storm that flattened Joplin, Mo., last year.

    The Joplin tornado, which killed more than 160 people last May, was distinguished by a rare multiple-vortex structure: In such storms, the center of the wind funnel spawns two to seven smaller twisters, or subvortices, that circulate around the edge of the cloud at speeds that can range up to 100 mph faster than the winds in the main funnel. The subvortices typically last less than a minute each.

    John Belski, a meteorologist at WAVE-TV in Louisville, Ky., said the tornado that ripped through Indiana's Clark County was a multiple-vortex tornado.


    "Those individual vortexes are very destructive," Purdue University tornado researcher Ernest Agee told me today. He emphasized that he couldn't confirm whether the Indiana storm had a multi-vortex structure, but noted that today's tornado outbreak was clearly a "big super-cell storm."

    "It's not uncommon for the stronger, more violent tornadoes to be multiple vortex," he said. One characteristic of such storms is a pattern of asymmetric damage. In some cases, one side of a structure might look relatively untouched, while the other side would be completely destroyed, he said.

    The National Weather Service's Storm Prediction Center says multi-vortex tornadoes are probably behind most reports of multiple tornadoes hitting at once — but on rare occasions, separate tornadoes can form close to each other as satellite tornadoes.

    Agee marveled at the breadth of today's outbreak, stretching up from Alabama to Indiana and beyond. But he said it looked as if the area's residents might have fared better than the victims of the Joplin storm did last year.

    "A lot of the people in the area had advance notice in terms of the forecast," he told me. "I'm sure it was pretty bad for the people who were affected, but the devastation could have been a lot worse."

    Update for 10 p.m. ET: Storm-chaser Skip Talbot's photo of the Henryville tornado confirms that it had a multiple-vortex structure. I've also added a video from The Associated Press' YouTube channel that clearly shows the funnel cloud spawning subvortices. To read other reports from the field, check out the Stormtrack website.

    More about tornadoes:


    Alan Boyle is msnbc.com's science editor. Connect with the Cosmic Log community by "liking" the log's Facebook page, following @b0yle on Twitter or adding Cosmic Log's Google+ page to your circle. You can also check out "The Case for Pluto," my book about the controversial dwarf planet and the search for other worlds.

  • Dark matter blob confounds experts

    This composite image shows the distribution of dark matter, galaxies, and hot gas in the core of the merging galaxy cluster Abell 520, formed from a violent collision of massive galaxy clusters. Starlight from galaxies is indicated in orange. Green indicates hot gas, and blue indicates mass, most of which is dark matter.




    Astronomers using the Hubble Space Telescope are mystified by a merging galaxy cluster known as Abell 520 in which concentrations of visible matter and dark matter have apparently come unglued.

    A report on the Hubble observations, published in the Astrophysical Journal, raises more questions than answers about a cosmic pile-up that's occurring 2.4 billion light-years away.

    "We were not expecting this," the study team's senior theorist, Arif Babul of the University of Victoria, said in a news release. "According to our current theory, galaxies and dark matter are expected to stay together, even through a collision. But that's not what's happening in Abell 520. Here, the dark matter appears to have pooled to form the dark core, but most of the associated galaxies seem to have moved on."


    The dark core was first detected in 2007 during a survey aimed at measuring the masses of 50 galaxy clusters using data from the Canada-France-Hawaii Telescope at Mauna Kea in Hawaii.

    The discovery presented the perfect opportunity to map the distribution of visible vs. dark matter in the cosmic mess. Studies have shown that we can see only about 15 percent of the matter in the universe. Most of the matter that exists around us can't be seen directly, but can be detected only by its gravitational effect. Scientists don't know what dark matter is, but they suspect it's an exotic class of subatomic particles that can interact only weakly with the kinds of matter we can see.

    Dark matter is thought to provide the invisible "scaffolding" for structure in the universe, gravitationally binding galaxy clusters into a cosmic web. Those clusters get so massive that they bend the light of distant galaxies like a lens. By analyzing those subtle deflections of light, it's possible to come up with a map showing where the dark matter lies. That's what astronomers did with Abell 520 — first with the telescope in Hawaii, and then with the Hubble Space Telescope's Wide Field Planetary Camera 2.

    The results contradict what scientists thought they knew about dark matter. In a previous study of the Bullet Cluster, 3 billion light-years from Earth, astronomers found that concentrations of dark matter blasted through the scene of a collision, with their associated galaxies tagging along. Meanwhile, waves of hot, X-ray-emitting gas clumped up in the middle.

    In the case of Abell 520, the situation is completely different: The galaxies sailed through the collision, but the dark matter piled up in the middle, along with the hot gas.

    Researchers were hoping that Hubble would resolve the mystery first posed by the detection of the dark core in 2007. No such luck.

    "We know of maybe six examples of high-speed galaxy cluster collisions where the dark matter has been mapped. But the Bullet Cluster and Abell 520 are the two that show the clearest evidence of recent mergers, and they are inconsistent with each other," James Jee, an astronomer at the University of California at Davis who is the lead author of the Astrophysical Journal paper, said in a news release from the Space Telescope Science Institute. "No single theory explains the different behavior of dark matter in those two collisions. We need more examples."

    Jee, Babul and their colleagues propose several possible explanations for the discrepancy. One explanation might be that the dynamics of the Abell 520 collision are more complex than the Bullet Cluster's crash. Maybe multiple collisions, involving three or four galaxy clusters, have led to the dark matter pile-up.

    Another possibility is that there's actually lots of ordinary galactic material in the core, but it's just too dim to be seen, even by Hubble. That would suggest that the super-dim galaxies in the core have somehow formed far fewer stars than normal galaxies.

    The most unsettling scenario proposes that there are different kinds of dark matter, and some of those kinds are "stickier" than others. Abell 520 might have a particularly sticky kind of dark matter that interacts with itself and clumps up like a wet snowball.

    The astronomers behind the Abell 520 observations are now planning to run computer simulations of cluster crashes to find out whether there's an unusual set of conditions that could produce those observations and still fit current theory. "My colleagues tell me the likelihood is nil," Andisheh Mahdavi, a member of the study team from San Francisco State University, said in a news release, "but now we have the responsibility to go and do the hard work to check the simulations."

    If the simulations aren't successful, the mystery might have to be left for particle physicists to mull over. Some hope that experiments such as Europe's Large Hadron Collider and the Alpha Magnetic Spectrometer, installed last year on the International Space Station, will eventually shed additional light on the dark matter mystery.

    "I'm just as perplexed as I was back in 2007," Mahdavi said. "It's a pretty disturbing observation to have out there."

    Update for 5:40 p.m. ET March 2: The picture of Abell 520 served as this week's "Where in the Cosmos" picture puzzle on the Cosmic Log Facebook page this morning, and it took only a few minutes for Ryan Marquis to figure out what the image was all about. "It appears the dark matter and galaxies aren't anchored as previously believed," he wrote.

    I'm sending Ryan a pair of 3-D glasses as a token of my appreciation. It turns out Ryan's a fellow space blogger who posts his items on 46BLYZ. We're glad to have him as a Cosmic Log correspondent, and hope that more of you will join our Facebook community. That's where you'll find the next "Where in the Cosmos" puzzle, a week from now.

    Correction for 9 p.m. ET March 5: The original version of this item had the wrong first name for SFSU's Andisheh Mahdavi. I regret the error and extend apologies to the professor.

    More about dark matter:


    In addition to Jee, Mahdavi and Babul, the authors of "A Study of the Dark Core in A520 With Hubble Space Telescope: The Mystery Deepens" include H. Hoekstra, J.J. Dalanton, P. Carroll and P. Capak.

    Alan Boyle is msnbc.com's science editor. Connect with the Cosmic Log community by "liking" the log's Facebook page, following @b0yle on Twitter or adding Cosmic Log's Google+ page to your circle. You can also check out "The Case for Pluto," my book about the controversial dwarf planet and the search for other worlds.

  • Christian tomb talk turns 'ugly'

    James Tabor / UNCC

    A replica of the "Jonah Fish" bone box, on display at Discovery Times Square in New York, shows a fishlike figure on the left side of the box's front. Small fish figures are inscribed in a border along the top of the box. The right side of the box's front is incomplete because that area was obscured by an adjacent bone box.




    The debate over a 1st-century "Jesus Discovery" tomb that may, or may not, contain the earliest known evidence of Christian iconography has taken on some of the fervor of a holy war, with some scriptural scholars protesting what they see as the "Da Vinci Codification" of modern culture.

    The controversy focused on whether a fishlike figure carved into one of the limestone bone boxes from the Jerusalem tomb was really meant to be a fish — or something else. It's a key point, because fish have historically been seen as early Christian symbols, and such symbols have not previously been found on Jerusalem bone boxes.

    "The 'Jonah Fish' is just the next installment in the Jesus-archaeology franchise — timed, as always, to precede a major Christian feast," Steven Fine, director of Yeshiva University's Center for Israel Studies, complained in a posting to the ASOR Blog, which is published by the American Schools of Oriental Research. "I, for one, am wearied by the almost yearly 'teaching moment' presented by these types of 'discoveries.' I am hopeful, however, that — this time — a forceful and quick display of unanimous dissent by the leading members of the academic community will be taken seriously by the media and the public at large."


    The underground chamber, known as the Patio Tomb because it lies beneath the patio of a present-day condo building, was explored a couple of years ago with the aid of a camera-equipped robotic arm. The project came into the global spotlight this week with the publication of "The Jesus Discovery," a book about the finds made there.

    A documentary TV show, reportedly titled "The Resurrection Tomb," is due to air on the Discovery Channel this spring. It's not yet clear whether that show will be broadcast around the time of Easter Sunday, which falls on April 8 this year (April 15 for Orthodox Christians).

    Discovery Times Square

    In addition to the "Jonah Fish" bone box, investigators examined a different limestone bone box that had an inscription scrawled in the central area of the front face. They interpreted the third line of the inscription as referring to "lifting up" or resurrection. Such a reference could be read as a statement of faith. This is a replica of the casket that is on display at Discovery Times Square in New York.

    This week's claims about the Christian character of the bone boxes seen in the Patio Tomb have attracted sharp criticism from outside experts. The tone of the debate has become so sharp that one of the scriptural scholars behind the discovery, James Tabor of the University of North Carolina at Charlotte, appealed today for an end to the "personal innuendos and ugly charges about greed and corruption."

    "I ask my fellow bloggers in our field to circulate this call for a change in our tone and approach to one another," he wrote on his own blog. "Enough is enough. ..."

    One of Tabor's partners in the tomb study is Rami Arav, an Israeli-born archaeologist at the University of Nebraska at Omaha who has directed excavations in Israel for more than two decades. Arav told me today that the controversy over the findings was not unexpected.

    "Whenever you make a pioneering discovery ... there will always be questions about the interpretation of what you see, particularly when things are not unequivocal," he said. "My philosophy in this kind of thing is that a good theory ... is elegant and solves more problems than it creates."

    Bebeto Matthews / AP

    Biblical scholar James Tabor glances over at replicas of two bone boxes found in Jerusalem's Patio Tomb during a Tuesday news conference at Discovery Times Square. A camera-equipped robotic arm like the one seen here was used to examine the boxes remotely.

    Believing a fish story
    For some, the claims about the "Jonah Fish" constitute a big problem. Tabor, Arav and another partner, documentary filmmaker Simcha Jacobovici, have suggested that the figure alludes to the biblical story of the prophet Jonah, who was swallowed by a sea creature and vomited up alive three days later. That story held extra significance for Christians, who believed Jesus died on the cross and rose from his tomb on the third day.

    The critics of the "Jesus Discovery" team say they're not swallowing the fish story. Instead, they maintain that the figure depicts a type of funerary pillar or tower, known as a "nephesh tower," or perhaps an amphora or vase. Some experts included pictures from other bone boxes, showing nephesh towers with pointed roofs.

    Arav and Tabor said they had considered the interpretation of the picture as a tower or a vase, but decided that the fish made more sense. "If we suggest it could have been a tower, then we would have to put the ossuary upside down," Arav said. "This doesn't have any precedent, and I think this is even more problematic than saying it is a fish."

    The team's video examination of the box also spotted several small, simple fish figures carved into an ornamental border around the main figure.

    "It creates problems which I indeed don't think are problems," Arav said. "We know that the Jonah motif appears later on, but that doesn't mean that it began later on. This is not a real problem."

    Jacobovici told me that he put the picture to the "Mishi test," named after his 5-year-old daughter. When he heard that some experts were suggesting that the picture showed a tower, he called Mishi over to take a look. "I said, 'What do you see here, sweetie?' She looks very intense, and says, 'A person inside a fish?'" Jacobovici recalled. "It passed the Mishi test."

    Why fuss over a fish?
    What difference does it make whether the picture shows a fish or a tower? The eventual outcome of the debate could have a big impact on the course of biblical archaeology. If the iconography is determined to be Christian, that would lend much more significance to what otherwise might be seen as a run-of-the-mill Jewish tomb.

    What's more, Tabor and Jacobovici contend that the discovery of a Christian tomb strengthens their far more controversial claim, first made in 2007, that bone boxes in a nearby tomb might contain the earthly remains of Jesus and members of his family. The investigators reached that conclusion based on the names inscribed on the boxes, and their similarity to the names listed in biblical accounts of Jesus' brothers and sisters. Tabor says additional studies published since 2007 have strengthened his case, but other scholars are unconvinced.

    Arav isn't getting involved in the debate over the "Jesus Family Tomb." But he does want to return to the Patio Tomb and go beyond the fishy debate. "We did non-invasive research in this place, and we discovered what we discovered," Arav said. "But we need also to do some invasive research."

    Current estimates suggest that the Patio Tomb was used sometime between 20 B.C. and A.D. 70, when Jerusalem was destroyed by the Romans. Arav would like to get a better sense of the date, and perhaps run DNA tests on the remains "to see if they are associated with groups of people that we know of." It might also be possible to run tests on a cooking pot that was brought out from the tomb years ago, "to see what was offered to the dead," he said.

    "There are a lot of things that hard science can help us with," Arav observed. "There are a lot of things to do."

    More about bone boxes and biblical archaeology:


    Replicas of bone boxes from the Patio Tomb and the Jesus Family Tomb are on display at Discovery Times Square in New York City, which is also hosting an exhibit about the Dead Sea Scrolls and daily life in biblical times. The exhibit runs through April 15.

    Alan Boyle is msnbc.com's science editor. Connect with the Cosmic Log community by "liking" the log's Facebook page, following @b0yle on Twitter or adding Cosmic Log's Google+ page to your circle. You can also check out "The Case for Pluto," my book about the controversial dwarf planet and the search for other worlds.

Jump to March 2012 archive page: 1 2 3