Concept drawing of the DE-STAR system engaging both an asteroid for evaporation or composition analysis, and simultaneously propelling an interplanetary spacecraft. Credit: Courtesy Philip M. Lubin

This plot shows time to evaporate an Apophis-like asteroid versus diameter of the asteroid, versus several laser power levels. The baseline DE-STAR 4 system has approximately 100 gigawatts of laser power. Credit: Courtesy Philip M. Lubin

This plot shows DE-STAR laser power and spot diameter versus DE-STAR array size. The DE-STAR system is modular and can be built up in sections each of which is immediately operational. Credit: Courtesy Philip M. Lubin

Vaporizing Threatening Asteroids

Source: UC Santa Barbara press release

Meteorites, Comets and Asteroids

Posted: 02/16/13

Summary: Scientists have proposed a system that could eliminate the threat of asteroids that are roughly half the size of a football field. The process would take only an hour. The system also could destroy asteroids 10 times larger in about a year.

As an asteroid roughly half as large as a football field — and with energy equal to a large hydrogen bomb — readied for a fly-by of Earth on Friday, two California scientists unveiled their proposal for a system that could eliminate a threat of this size in an hour. The same system could destroy asteroids 10 times larger than the one known as 2012 DA14 in about a year, with evaporation starting at a distance as far away as the Sun.

UC Santa Barbara physicist and professor Philip M. Lubin, and Gary B. Hughes, a researcher and professor from California Polytechnic State University, San Luis Obispo, conceived DE-STAR, or Directed Energy Solar Targeting of Asteroids and exploRation, as a realistic means of mitigating potential threats posed to the Earth by asteroids and comets.

“We have to come to grips with discussing these issues in a logical and rational way,” said Lubin, who began work on DE-STAR a year ago. “We need to be proactive rather than reactive in dealing with threats. Duck and cover is not an option. We can actually do something about it and it’s credible to do something. So let’s begin along this path. Let’s start small and work our way up. There is no need to break the bank to start.”

Described as a “directed energy orbital defense system,” DE-STAR is designed to harness some of the power of the Sun and convert it into a massive phased array of laser beams that can destroy, or evaporate, asteroids posing a potential threat to Earth. It is equally capable of changing an asteroid’s orbit — deflecting it away from Earth, or into the Sun — and may also prove to be a valuable tool for assessing an asteroid’s composition, enabling lucrative, rare-element mining. And it’s entirely based on current essential technology.

Read more: Vaporizing Threatening Asteroids — Astrobiology Magazine.

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