Aidan Gilkes

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Asteroids that threaten Earth could be deflected from their orbits using directed energy to vaporize the surface, as the ejected plume creates a reaction thrust that alters the asteroid’s trajectory. In this situation, a critical issue is the rotation of the asteroid relative to the directed energy beam, as this will reduce the average thrust magnitude and(More)
In the nearly 60 years of spaceflight we have accomplished wonderful feats of exploration and shown the incredible spirit of the human drive to explore and understand our universe. Yet in those 60 years we have barely left our solar system with the Voyager 1 spacecraft launched in 1977 finally leaving the solar system after 37 years of flight at a speed of(More)
A new technique for image compression and/or enhancement is presented. The method comprises dividing the two-dimensional spectrum into low- and high-frequency components and digitizing the latter with a tapered, randomized quantizer. A version of the system in which the highs component is adaptively adjusted gives improved picture quality.
The Earth is continuously under threat from asteroids. We in the DE-STAR (Directed Energy System for Targeting of Asteroids and exploRation) Lab are working on technology to defend Earth from this threat. To do this, we use focused kilowatt-class lasers to vaporize a point on the asteroid’s surface, and create a plume of ejected asteroid material that acts(More)
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