US Scientists Consider Using Nuclear Explosions to Protect Earth From Asteroids, Media Says

One of the science team members pointed to the importance of investigating “all asteroid mitigation technologies in order to maximise the tools in our toolkit,” suggesting that, in some cases, a nuclear solution might be preferable to a non-nuclear one.

Scientists at the Lawrence Livermore National Laboratory in the United States are trying to develop a new method of altering the trajectories of asteroids that might threaten Earth, CBS affiliate KTVT reports.

According to the media outlet, the researchers have joined forces with “an Air Force team of technologists” and, as team member Lansing Horan IV has explained, set their sights on neutron radiation produced by a nuclear detonation to achieve their goal.

Noting that neutrons can be more penetrative than X-rays, Horan explained that “this means that a neutron yield can potentially heat greater amounts of asteroid surface material, and therefore be more effective for deflecting asteroids than an X-ray yield.”

The two basic options of dealing with an incoming asteroid, Horan said, are disruption – which essentially means supplying enough energy to shatter an asteroid into numerous fragments – and deflection – altering an asteroid’s course with a discharge of energy.

While disruption “would likely be considered if the warning time before an asteroid impact is short and/or the asteroid is relatively small,” he added, deflection “might generally be preferred as the safer and more ‘elegant’ option, if we have sufficient warning time to enact this sort of response.”

“One ultimate goal would be to determine the optimal neutron energy spectrum, the spread of neutron energy outputs that deposit their energies in the most ideal way to maximise the resulting velocity change or deflection,” he said.

The researcher further stressed the importance of studying and understanding “all asteroid mitigation technologies in order to maximise the tools in our toolkit,” arguing that, in some scenarios, the use of a nuclear device “would come with several advantages over non-nuclear alternatives.”

“In fact, if the warning time is short and/or the incident asteroid is large, a nuclear explosive might be our only practical option for deflection and/or disruption,” he remarked.

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