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A group of researcher wants to economise Earth from a potentialasteroidapocalypse using a new global defense method acting they call PI — unforesightful for " Pulverize It . "
The architectural plan — detailed in a lengthytechnical paperon the University of California , Santa Barbara ( UCSB)Experimental Cosmology Group websiteand submitted to the diary Advances in Space Research — aims to demolish declamatory , potentially life - threatening asteroids into hundreds of tiny piece by launching an raiment of " penetrator rods " into the asteroid ’s path .
An illustration showing an asteroid being pulverized to pieces.
These rods , each measuring about 6 to 10 foot long ( 1.8 to 3 meter , could contain explosive — potentially even nuclear ones — to blast an approach asteroid into comparatively harmless bits long before it reachesEarth’satmosphere , the researcher wrote .
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The resulting shower of debris could still cause harm to structures and humans down below , the authors said . But this price would be negligible compared with the impingement of a large asteroid , like the 62 - foot panoptic ( 19 m ) meteor thatexploded over Chelyabinsk , Russiain February 2013 with rough the lastingness of 30Hiroshimabombs . ( The result shockwaves could have kill millions of people had the meteor explode directly over a major city , but the blast occurred over a broad sphere outside the city of Chelyabinsk , resulting in harm and accidental injury but no fatality ) .
The PI plan would deploy dozens of spear-like “penetrator rods” directly into an approaching asteroid’s path, “pulverizing” the rock into hundreds of pieces.
To practice a cartoon doctrine of analogy , the remainder between one bombastic asteroid and hundreds of smaller ones is consanguineal to " a 500 - kilogram [ 1,100 - lbf. ] marvellous piano being dropped on your head from a peak of one kilometer … [ or ] 500 kilograms of froth balls dropped on you from the same height , " study authors Philip Lubin and Alexander Cohen , both physicists at UCSB , wrote in a recent editorial forScientific American .
The looming threat
NASAtracks the movements of more than 8,000 near - Earth asteroid with diameters greater than 460 feet ( 140 m ) . However , as the Chelyabinsk incident showed , smaller object can still pack a Brobdingnagian punch .
Part of the reason that the Chelyabinsk meteor was so destructive is that astronomers did n’t see it come ; the rock ‘n’ roll was importantly smaller than the asteroid that place agencies typically track , and it fool away at Earth directly from the counsel of the sunlight , agree to NASA .
One advantage of the PI plan is that a rocket full of penetrator perch could theoretically be launched with super short card , the researchers said — even simple minutes before an object reaches Earth ’s atmosphere .
" An impactor the size of the 20 - meter - wide space rock that broke up over Chelyabinsk , Russia … could be wiretap a simple 100 seconds prior to affect " using a launcher interchangeable to the eccentric used for intercontinental ballistic projectile , the investigator wrote in Scientific American .
Meanwhile , a rock’n’roll the size of it of the 1,200 - foot - wide-eyed ( 370 megabyte ) asteroidApophiscould " be dealt with 10 days prior to strike Earth , " the squad pronounce . exist rocket technology , likeSpaceX ’s Falcon 9 launch vehicle , could easily deploy the explosive retinal rod to the part around such an asteroid .
If those estimate are precise , then the PI method would be a considerably more flexible planet DoD plan than NASA ’s current missionary station to alter the course of a near - Earth asteroid by smash a arugula into it . That charge , do it asthe Double Asteroid Redirection Test ( DART ) , will launch in November , but nearly a year will happen before the test rocket pass its target : the 525 - groundwork - wide ( 160 yard ) synodic month of the asteroid Didymos . If successful , the rocket impact will slow the moon ’s orbit just enough for astronomers to determine whether asteroid redirection is even in force .
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But PI would ask extensive examination to turn out viable , as well , starting with ground - based testing on faux asteroid , then moving to real quarry in quad . At the moment , no such tests have been planned .
The method ’s achiever also hinge on scientist ' ability to detect small near - Earth asteroid like the Chelyabinsk impactor before they enter the atmosphere . This , too , is a work in progress .
" Without a suitable ' early warning organization , ' PI and any other planetary defence method acting would offer suboptimal protection , " The authors concluded in their Scientific American composition . " PI is just one patch of this urgent puzzle : To properly protect the earthly concern , we must amply give more eyes on the skies . "
to begin with published on Live Science .
