News / Science & Technology

    Siberian Blast Points to More Destructive Meteors Ahead

    A meteorite contrail is seen over Chelyabinsk, February 15, 2013.
    A meteorite contrail is seen over Chelyabinsk, February 15, 2013.
    Adam Phillips
    The idea that the orbiting chunks of interplanetary rocks called asteroids could hit the Earth and wipe out cities, or even life itself, is a familiar theme in space-based adventure films. But according to three just-released scientific studies in the journals Nature and Science, the likelihood that dangerous asteroids will enter Earth’s atmosphere may be greater than previously believed.

    On February 15 of this year, the world was inundated with dramatic video images of a 19-meter-wide meteor streaking across the sky above Chelyabinsk, Russia at nearly 67,000 kilometers per hour. Well over 1,000 people were injured by the event, mostly from the blinding flash and from broken window glass. Still, according to physicist Paul Wiegert of the University of Western Ontario and an author of a study of the Chelyabinsk meteor just published in the journal “Nature”…  

    “… Chelyabinsk didn’t really create as much damage as we might have expected, and that’s a good thing. The flip side is that we are now starting to discover that events like the Chelyabinsk event are occurring more frequently than we had originally anticipated. But we’ll have to wait a little while longer and collect a little more information before we can know for sure," said Wiegert.

    Wiegert adds that collecting that information about orbiting asteroids the size of the one that exploded over Chelyabinsk, then determining their path relative to Earth, is a difficult job using conventional earth-based telescopes.  

    “Larger asteroids are relatively easily seen with telescopes because they are fairly big. Much, much smaller objects are much more common and frequently hit the earth as meteorites - shooting stars, falling stars and things like that. So we see the bigger objects and we see the smaller objects relatively well. But the Chelyabinsk event kind of falls into the gap between the two," he said.

    At a recent panel of the Association of Space Explorers in New York, physicist and former astronaut Ed Lu warned there is little time to lose. He said there are about 10,000 known asteroids orbiting our region of the solar system - that’s just one-thousandth of the number scientists believe could actually be there. Lu's B612 Foundation is planning to help launch a space-based infrared telescope in 2018 that can detect the heat emitted by asteroids, map their position and orbit, then provide a warning in time to mount an international effort to deflect the more dangerous ones.  

    “You cannot deflect an asteroid that you haven’t found. And the technology exists, the know-how exists and we realized that the cost of finding and tracking these things, the telescope to do that, is about what it cost to build a large freeway overpass," said Lu.

    Paul Wiegert says he’s fascinated by the Chelyabinsk event and would welcome the launch of an infrared space telescope to locate similar asteroids.

    “But I don’t think the Chelyabinsk event has really increased our perception of the danger. You won’t have any difficulty finding someone who thinks we should be spending more money looking for more asteroids. But I don’t think anybody in the asteroid community is sleeping any less soundly because of that event," he said.

    Nevertheless, officials at NASA’s Near Earth Object program, which scans the heavens for dangerous objects, say the space agency is reassessing what size rocks to look for and how often they are likely to hit.

    You May Like

    Top US General: Turkish Media Report ‘Absurd'

    General Dunford rejects ‘irresponsible' claims of coup involvement by former four-star Army General Campbell, who led NATO forces in Afghanistan before retiring earlier this year

    Video Saving Ethiopian Children Thought to Be Cursed

    'Omo Child' looks at efforts of one African man to stop killings of ‘mingi’ children

    Protests Over Western Troops Threaten Libyan 'Unity' Government

    Fears mount that Islamist foes of ‘unity' government plan to declare a revolutionaries' council in Tripoli

    Featured Videos

    Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
    London’s Financial Crown at Risk as Rivals Eye Brexit Opportunitiesi
    X
    VOA News
    July 25, 2016 5:09 PM
    By most measures, London rivals New York as the only true global financial center. But Britain’s vote to leave the European Union – so-called ‘Brexit’ – means the city could lose its right to sell services tariff-free across the bloc, risking its position as Europe’s financial headquarters. Already some banks have said they may shift operations to the mainland. Henry Ridgwell reports from London.
    Video

    Video London’s Financial Crown at Risk as Rivals Eye Brexit Opportunities

    By most measures, London rivals New York as the only true global financial center. But Britain’s vote to leave the European Union – so-called ‘Brexit’ – means the city could lose its right to sell services tariff-free across the bloc, risking its position as Europe’s financial headquarters. Already some banks have said they may shift operations to the mainland. Henry Ridgwell reports from London.
    Video

    Video Recycling Lifeline for Lebanon’s Last Glassblowers

    In a small Lebanese coastal town, one family is preserving a craft that stretches back millennia. The art of glass blowing was developed by Phoenicians in the region, and the Khalifehs say they are the only ones keeping the skill alive in Lebanon. But despite teaming up with an eco-entrepreneur and receiving an unexpected boost from the country’s recent trash crisis the future remains uncertain. John Owens reports from Sarafand.
    Video

    Video Migrants Continue to Risk Lives Crossing US Border from Mexico

    In his speech Thursday before the Republican National Convention, the party’s presidential candidate, Donald Trump, reiterated his proposal to build a wall along the U.S.-Mexico border if elected. Polls show a large percentage of Americans support better control of the nation's southwestern border, but as VOA’s Greg Flakus reports from the border town of Nogales in the Mexican state of Sonora, the situation faced by people trying to cross the border is already daunting.
    Video

    Video In State of Emergency, Turkey’s Erdogan Focuses on Spiritual Movement

    The state of emergency that Turkish President Recep Tayyip Erdogan has declared is giving him even more power to expand a purge that has seen an estimated 60,000 people either arrested or suspended from their jobs. VOA Europe correspondent Luis Ramirez reports from Istanbul.
    Video

    Video Calm the Waters: US Doubles Down Diplomatic Efforts in ASEAN Meetings

    The United States is redoubling diplomatic efforts and looking to upcoming regional meetings to calm the waters after an international tribunal invalidated the legal basis of Beijing's extensive claims in the South China Sea. VOA State Department correspondent Nike Ching has the story.
    Video

    Video Four Brother Goats Arrive in Brooklyn on a Mission

    While it's unusual to see farm animals in cities, it's become familiar for residents of Brooklyn, New York, to see a little herd of goats. Unlike gas-powered mowing equipment, goats remove invasive weeds quietly and without adding more pollution to the air. As Faiza Elmasry tells us, this is a pilot program and if it proves to be successful, the goat gardener program will be extended to other areas of New York. Faith Lapidus narrates.
    Video

    Video Scientists in Poland Race to Save Honeybees

    Honeybees are in danger worldwide. Causes of what's known as colony collapse disorder range from pesticides and loss of habitat to infections. But scientists in Poland say they are on track to finding a cure for one of the diseases. VOA’s George Putic reports.
    Video

    Video Wall Already Runs Along Parts of US-Mexico Border

    The Republican Party’s presidential nominee, Donald Trump, gained the support of many voters by saying he would build a wall to keep undocumented immigrants and drugs from coming across the border from Mexico. Critics have called his idea impractical and offensive to Mexico, while supporters say such a bold approach is needed to control the border. VOA’s Greg Flakus has more from the border town of Nogales, Arizona.
    Video

    Video New HIV Tests Emphasize Rapid Results

    As the global fight against AIDS intensifies, activists have placed increasing importance on getting people to know their HIV status. Some companies are developing new HIV testing methods designed to be quick, easy and accurate. Thuso Khumalo looks at the latest methods, presented at the International AIDS conference in Durban, South Africa.
    Video

    Video African Youth with HIV Urge More Support

    HIV, the virus that causes AIDS, is the top killer of teens in sub-Saharan Africa. But many youths say their experience with the virus is unique and needs to be addressed differently than the adult epidemic. VOA South African Correspondent Anita Powell reports.
    Video

    Video Pop-Up Art Comes to Your Living Room, Backyard and Elsewhere

    Around the world, independent artists and musicians wrestle with a common problem: where to exhibit or perform? Traditional spaces such as museums and galleries are reserved for bigger names, and renting a space is not feasible for many. Enter ArtsUp, which connects artists with venue owners. Whether it’s a living room, restaurant, office or even a boat, pop-up events are bringing music and art to unexpected places. Tina Trinh has more.
    Video

    Video Scotland’s Booming Whisky Industry Fears Brexit Hangover

    After Britain’s vote to leave the European Union, Scotland’s government wants to break away from the United Kingdom – fearing the nation’s exports are at risk. Among the biggest of these is whisky. Henry Ridgwell reports on a time of turmoil for those involved in the ancient art of distilling Scotland’s most famous product.

    Special Report

    Adrift The Invisible African Diaspora