huh, a man said, and a man did… did he?
crazy concept!
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Browsing the archives for the Science category.
The tube is a distortion of spacetime that can be intentionally created (using hypothetical technology) in the wake of travel near the speed of light. The Krasnikov Tube allows for a return trip that takes you back to the time right after you left. This several light-year long man-shaped “tube” might arguably constitute a megastructure, but unlike most megastructures it’s not constructed of physical matter such as titanium or plastic, but instead is just a warpage of spacetime.[2]
This spacetime diagram shows the causal structure of a Krasnikov tube; the U-shaped line is the boundary of the tube, while the diagonal lines represent the forward light cones of the dots.
Experiencing the effect requires that the traveller races along the tube at speeds close to that of light.
via Krasnikov tube – Wikipedia, the free encyclopedia.
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» http://www.mindfully.org/Health/Space-Survival-NG1jan01.htm
Three days on the moon in the final Apollo mission, in 1972, leave astronaut Eugene Cernan weary and filthy with rock dust. A three-year trip to Mars multiplies the hazards of space travel, confronting NASA with a troubling scenario. Imagine a radiation-sick, sleep-deprived astronaut stepping on Mars. Muscle-and-bone-weakened, immune-system-challenged, he faints and breaks a leg. What now, Houston?
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» http://en.wikipedia.org/wiki/Busemann%27s_Biplane
Busemann’s Biplane is a conceptual airframe design invented by Adolf Busemannwhich inherently prohibits the formation of N-type shock waves and thus does not create a sonic boom.
It consists of two triangular cross-section plates a certain distance apart, with the flat sides parallel to the fluid flow. The spacing between the plates is sufficiently large that the flow does not choke and supersonic flow is maintained between them.
Usually with supersonic flow a positive pressure shock wave is generated at the front and a negative pressure shock wave at the rear. In Busemann’s biplane, the high pressure shock wave is created internally and reflects symmetrically between the two plates. This cancels/fills the expansion fan forming at the rear, leaving no external shock waves to propagate to infinity. The flat upper and lower surfaces generate no shock waves because the flow is parallel.
The internal alignment of the shock waves means that Busemann’s Biplane produces minimum wave drag[1]. However, the flat external surfaces and internal symmetry also mean that the airfoil does not produce any lift. Hence, no implementation has yet flown, although the concept has been successfully tested in wind tunnels and for ammunition.
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