“Even though these smaller asteroids don’t pose a threat to human civilization, they can still cause major damages and casualties on a regional level,” said Tom Kalil, deputy director for technology and innovation at the White House Office of Science and Technology Policy. (In 1908 an asteroid exploded over Siberia and flattened trees in a vast, unpopulated area.) It was the first recorded instance of an asteroid causing human casualties. The asteroid’s disintegration caused a shock wave that shattered windows and caused hundreds of injuries and major property damage. 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 search for NEOs took on greater urgency on Feb. The administration is asking Congress to double the budget for asteroid detection, to $40 million, Garver said.īut the Grand Challenge would elicit help from academics, international partners and backyard astronomers. Only 25 percent of those have been detected, many through NASA’s Near Earth Object Program. Asteroids that size are generally regarded as large enough to take out a city.Īccording to NASA, there are also probably about 25,000 near-Earth asteroids that are 100 meters (328 feet) or larger. Congress in 2005 charged NASA with finding all the asteroids greater than 140 meters (459 feet) in diameter. 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.īut as one goes down the size scale, these objects become more numerous and harder to detect. None poses a significant threat of striking the Earth in the foreseeable future. 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. The Earth coexists with a swarm of asteroids of varying sizes. They plan to study it this fall with the Spitzer Space Telescope.īut 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. For one thing, it might turn out to be too small. Two recent feasibility studies used as their reference a rock discovered in 2009, but NASA scientists aren’t sure that it will meet the mission requirements. At present, NASA has a short list of possible targets, but all need further scrutiny to see if they have the size, shape, spin rate and composition that the asteroid mission would require. The target rock has to be moving at a leisurely pace relative to the Earth, and ideally would come close to the Earth-moon system sometime in the early 2020s. And even before that, scientists would have to find the right asteroid. But first a robotic spacecraft would have to rendezvous with the asteroid and capture it. The proposed mission, which is early in the planning stages, would send astronauts to visit an asteroid that had been redirected into a high lunar orbit. There is a second, overlapping agenda at work here: The NASA human spaceflight program needs to find a target rock for what is now being called the Asteroid Redirect Mission (formerly the Asteroid Retrieval Mission), or ARM. She said the asteroid hunt would help prove that “we’re smarter than the dinosaurs.” “This is really a call to action to find all asteroid threats to human populations and know what to do about them,” NASA Deputy Administrator Lori Garver said Monday. The White House and NASA on Tuesday will ask the public for help finding asteroids that potentially could slam into the Earth with catastrophic consequences.Ĭiting planetary defense, the administration has decided that the search for killer rocks in space should be the latest in a series of “ Grand Challenges,” in which the government sets an ambitious goal, helps create public-private partnerships and sometimes offers prize money for innovative ideas.
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