{"id":8245,"date":"2019-03-08T09:29:40","date_gmt":"2019-03-08T14:29:40","guid":{"rendered":"http:\/\/www.monsffa.ca\/?p=8245"},"modified":"2019-03-08T09:29:40","modified_gmt":"2019-03-08T14:29:40","slug":"its-even-harder-to-destroy-asteroids-than-we-thought","status":"publish","type":"post","link":"https:\/\/www.monsffa.ca\/?p=8245","title":{"rendered":"It\u2019s even harder to destroy asteroids than we thought"},"content":{"rendered":"
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http:\/\/www.astronomy.com\/news\/2019\/03\/its-even-harder-to-destroy-asteroids-than-we-thought<\/a><\/p>\n

It\u2019s even harder to destroy asteroids than we thought<\/em><\/h1>\n
New research shows smacking an asteroid may fracture but not shatter it.<\/em><\/div>\n

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By Alison Klesman<\/a> \u00a0|\u00a0 Published: Thursday, March 07, 2019<\/div>\n<\/div>\n
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You\u2019ve likely heard by now that the movie Armageddon<\/em><\/strong> got it all wrong \u2014 it\u2019s just not feasible to blow up an asteroid heading toward Earth with a bomb or few. But how<\/em> unfeasible is it, really? New research set for publication March 15 in the planetary science journal Icarus<\/em><\/a> is sending any hope humanity might have had to nuke an incoming asteroid threat even further into the realm of impossibility. Breaking up asteroids, it turns out, is really, really hard to do.<\/div>\n
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\"AsteroidBreakup\"<\/a>
Smacking an asteroid with a bomb or a smaller asteroid should shatter it into manageable pieces, right? Wrong, a new study shows – this picture isn’t likely after a minor collision.NASA\/JPL-Caltech<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/div>\n
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The new study, led by recent Ph.D. graduate Charles El Mir from the Johns Hopkins University\u2019s Department of Mechanical Engineering, makes use of both recent advancements in understanding about the way rock fractures, as well as improved computer code to model what happens when you smack an asteroid with something big. \u201cOur question was, how much energy does it take to actually destroy an asteroid and break it into pieces?\u201d El Mir said in a press release<\/a>.<\/p>\n

The answer to that question, it turns out, is \u201cthat asteroids are stronger than we used to think and require more energy to be completely shattered,\u201d he said.<\/p>\n

A two-step process<\/h4>\n

The simulations run by El Mir and his colleagues allowed them to study the aftermath of an asteroid collision via a \u201chybrid\u201d approach that focuses on two different stages of a hit using two different types of computer code. They modeled an asteroid 15 miles (25 kilometers) across undergoing a head-on impact from a 0.75-mile-diameter (1.21 km) impactor made of basalt and traveling at 3 miles (5 km) per second.<\/p>\n

During the fictitious collision, a material model first showed the short-term fragmentation that took place within the asteroid just after it is struck, a process that occurs within just a fraction of a second. Then, their code handed the calculations over to a different type of model called an N-body model, which showed what happened over the longer term \u2014 hours after impact \u2014 as the asteroid\u2019s gravity influenced any small pieces that might have flown off during the collision.<\/p>\n

Would an asteroid shatter on impact? And what would happen to those pieces over time? Would they fly apart, or would they come back together to re-form the asteroid, nullifying the effects of the impact?<\/p>\n

In answer, the team found that no \u2014 the asteroid didn\u2019t shatter on impact. Instead, the initial impact causes millions of internal cracks to develop, and the areas nearest the hit actually flowed like sand, allowing a crater to form. But those cracks didn\u2019t destroy the asteroid; instead, they left behind a damaged but intact body that was large enough to pull any smaller pieces that may have flown off back onto itself, essentially completely reassembling the parent body.<\/p>\n