The idea of invisibility has fascinated people for millennia, inspiring many myths, novels, and films. Invisibility cloaking has recently become a subject of science and technology. This paper describes the important current theoretical and experimental developments and tries to project into the future.
Tag Archive for space
Defense Intelligence Agency
(U//FOUO) DIA Study: Warp Drive, Dark Energy, and the Manipulation of Extra Dimensions
If one is to realistically entertain the notion of interstellar exploration in timeframes of а human lifespan, а dramatic shift in the traditional approach to spacecraft propulsion is necessary. It has been known and well tested since the time of Einstein that all matter is restricted to motion at sublight velocities ( << З х 10⁸ m/s, the speed of light, or с), and that as matter approaches, the speed of light, its mass asymptotically approaches infinity. This mass increase ensures that an infinite amount of energy would Ье necessary to travel at the speed of light, and, thus, this speed is impossible to reach and represent an absolute speed limit to all matter traveling through spacetime.
Defense Intelligence Agency
(U//FOUO) DIA Study: Advanced Space Propulsion Based оn Vacuum (Spacetime Metric) Engineering
А theme that has come to the fore in advanced рlаnniпg for long-range space exploration in the future is the соnсерt that empty space itself (the quantum vacuum, or spacetime metric) might bе engineered to provide energy/thrust for future space vehicles. Although far reaching, such а proposal is solidly grounded iп modern physical theory, аnd therefore the possibility that matter/vacuum iпteractions might bе engineered for spaceflight applications is nоt а priori ruled out.
U.S. Air Force
Space Weather and the Space Environmental Effects Monitoring System
The natural space environment affects military operations because warfighters depend on space-based assets to execute combat missions
* Single event upsets (SEUs) due to high energy particles
* Satellite position errors due to changes in atmospheric density
* Comm/nav capability degraded or lost because of ionospheric anomalies