Before handling NASA's planetary defense, Johnson was the Near-Earth Object
Programs Executive for NASA's Planetary Sciences Division.
JPL manages and operates NASA's Deep Space Network, including the Goldstone Solar System Radar, and hosts the Center for Near-Earth Object
Studies for NASA's Near-Earth Object
Observations Program, an element of the Planetary Defense Coordination Office within the agency's Science Mission Directorate.
More than 90 percent of near-Earth objects
larger than 3,000 feet have already been discovered, NASA said.
20 ( ANI ): NASA's Near-Earth Object
Wide-field Infrared Survey Explorer (NEOWISE), a probe that made the most comprehensive survey to date of asteroids and comets, has sent its first set of test photos in preparation for a renewed mission.
He added: "The threat posed to mankind by the impact of an asteroid or comet is now widely recognised as one of the most significant risks to human civilisation, yet there is no coordinated international effort to identify threatening near-earth objects
, or to deal with them once detected."
DA14 belongs to a dangerous family of near-Earth objects
(NEOs) that are small enough to be missed but large enough to cause serious damage.
Vienna, Rabi'II 10, 1434, Feb 20, 2013, SPA -- The United Nations called Wednesday for the formation of an international network to monitor the threat posed by asteroids and other near-Earth objects
, according to dpa.
For more information on 2011 MD and other near-Earth objects
, visit http://neo.jpl.nasa.gov/.
Astronomers first spotted the asteroids three days before the close encounter, using the Catalina Sky Survey telescope near Tucson, which scans the skies for near-Earth objects
. The larger asteroid was estimated to be 10 to 20 meters in diameter, and the smaller 6 to 14 meters across.
Pan-STARRS's prime goal is to catalog potentially hazardous near-Earth objects
as small as 100 meters.
"The international interest in lunar science and, more recently, near-Earth objects
led to the