North Jefferson News, Gardendale, AL

Community News Network

June 18, 2013

White House, NASA want help hunting asteroids

(Continued)

WASHINGTON —

But NASA scientists are clearly eager to speed up the rate of discovery of small asteroids, and thus expand the pool of candidate rocks for the ARM mission.

The Earth coexists with a swarm of asteroids of varying sizes. Thanks to a number of asteroid searches in the past 15 years, some funded by NASA, about 95 percent of the near-Earth objects (NEOs) larger than 1 kilometer (about three-fifths of a mile) in diameter have already been detected, and their trajectories calculated. None poses a significant threat of striking the Earth in the foreseeable future.

The science is clear: Catastrophic impacts, such as the one implicated in the extinction of the dinosaurs about 65 million years ago, are very rare, and no one needs to panic about killer rocks.

But as one goes down the size scale, these objects become more numerous and harder to detect. Congress in 2005 charged NASA with finding all the asteroids greater than 140 meters (459 feet) in diameter. Asteroids that size are generally regarded as large enough to take out a city.

According to NASA, there are also probably about 25,000 near-Earth asteroids that are 100 meters (328 feet) or larger. Only 25 percent of those have been detected, many through NASA's Near Earth Object Program. The administration is asking Congress to double the budget for asteroid detection, to $40 million, Garver said.

But the Grand Challenge would elicit help from academics, international partners and backyard astronomers. The search for NEOs took on greater urgency on Feb. 15, when, on the very day that a previously detected asteroid was about to make a close pass of the Earth, an unknown 50-foot-diameter rock came out of the glare of the sun and fireballed through the atmosphere above the Russian city of Chelyabinsk.

The asteroid's disintegration caused a shock wave that shattered windows and caused hundreds of injuries and major property damage. It was the first recorded instance of an asteroid causing human casualties. (In 1908 an asteroid exploded over Siberia and flattened trees in a vast, unpopulated area.)

Text Only
Community News Network
  • 20140729-AMX-GIVHAN292.jpg Spanx stretches into new territory with jeans, but promised magic is elusive

    The Spanx empire of stomach-flattening, thigh-slimming, jiggle-reducing foundation garments has expanded to include what the brand promises is the mother of all body-shaping miracles: Spanx jeans.

    July 29, 2014 1 Photo

  • Medical marijuana opponents' most powerful argument is at odds with a mountain of research

    Opponents of marijuana legalization are rapidly losing the battle for hearts and minds. Simply put, the public understands that however you measure the consequences of marijuana use, the drug is significantly less harmful to users and society than tobacco or alcohol.

    July 29, 2014

  • linda-ronstadt.jpg Obama had crush on First Lady of Rock

    Linda Ronstadt remained composed as she walked up to claim her National Medal of Arts at a White House ceremony Monday afternoon.

    July 29, 2014 1 Photo

  • Can black women have it all?

    In a powerful new essay for the National Journal, my friend Michel Martin makes a compelling case for why we need to continue the having-it-all conversation.

    July 29, 2014

  • Dangerous Darkies Logo.png Redskins not the only nickname to cause a stir

    Daniel Snyder has come under fire for refusing to change the mascot of his NFL team, the Washington Redskins. The Redskins, however, are far from being the only controversial mascot in sports history.  Here is a sampling of athletic teams from all areas of the sports world that were outside the norm.

    July 28, 2014 3 Photos

  • 'Rebel' mascot rising from the dead

    Students and alumni from a Richmond, Va.-area high school are seeking to revive the school's historic mascot, a Confederate soldier known as the "Rebel Man," spurring debate about the appropriateness of public school connections to the Civil War and its icons.

    July 28, 2014

  • Fast food comes to standstill in China

    The shortage of meat is the result of China's latest food scandal, in which a Shanghai supplier allegedly tackled the problem of expired meat by putting it in new packaging and shipping it to fast-food restaurants around the country

    July 28, 2014

  • wd saturday tobias .jpg Stranger’s generosity stuns Ohio veteran

    Vietnam War veteran David A. Tobias was overwhelmed recently when a fellow customer at an OfficeMax store near Ashtabula, Ohio paid for a computer he was purchasing.

    July 28, 2014 1 Photo

  • Screen Shot 2014-07-28 at 1.33.11 PM.png VIDEO: High-dive accident caught on tape

    A woman at a water park in Idaho leaped off a 22-foot high dive platform, then tried to pull herself back up with frightening results. Fortunately, she escaped with only a cut to her finger.

    July 28, 2014 1 Photo

  • CATS-DOGS281.jpg Where cats are more popular than dogs in the U.S.-and all over the world

    We all know there are only two types of people in the world: cat people and dog people. But data from market research firm Euromonitor suggest that these differences extend beyond individual preferences and to the realm of geopolitics: it turns out there are cat countries and dog countries, too.

    July 28, 2014 1 Photo