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Records 901 to 930 of 1973 - Sorted by Most Recent First
AncientAstronauts Ancient UFOs - Images from Historical Artwork XFacts Research
Website on ancient UFOs and UFOs in historical artwork. Includes many images with descriptions of historical artwork possibly depicting UFOs.
Posted on 1/5/2004 1:02:39 AM
UnitedKingdom British Ministry of Defence established secret UFO investigation group Ananova News, 2nd January 2002
Official papers have revealed the Ministry of Defence set up a secret flying saucer working party in the 1950s. The papers show the group involved experts from the Directorate of Scientific Intelligence and the Joint Technical Intelligence Committee.
R Posted on 1/5/2004 12:56:03 AM
SpeedofLight How to travel faster than light? Richard Milton, Alternative Science
In his long and distinguished career, Arthur C Clarke has had a disconcerting habit of thinking of things first, that others dismiss as nonsense. Now, in his latest prophetic work "3001: The Final Odyssey" -- looking forward to the next millennium -- Clarke may well have done it again, this time by giving a simple five-letter name to a fictional propulsion unit -- the "SHARP Drive".
R Posted on 1/5/2004 12:36:43 AM
InterstellarTravel Interstellar Travel - An Annotated Bibliography Warp Drive, When? - Marc Millis, NASA Glenn Research Center
An annotated bibliography of resources on interstellar travel, including overviews, introductions to emerging physics, and detailed technical papers.
R Posted on 1/5/2004 12:24:17 AM
InterstellarTravel Advanced Propulsion Concepts NASA Jet Propulsion Laboratory, California Institute of Technology
This website has been compiled from version 1.0 of a CD assembled by JPL in 1989 as an overview of advanced space propulsion concepts.
Posted on 1/5/2004 12:00:59 AM
SpeedofLight Is Light-Speed in Your Future? Wired News, June 11, 1999
Star Trek fans longing to travel at warp factor 9, take heart: New research indicates that travel faster than the speed of light is theoretically possible.
R Posted on 1/4/2004 11:57:42 PM
InterstellarTravel Emerging Possibilities for Space Propulsion Breakthroughs Marc G. Millis, Space Propulsion Technology Division, NASA Lewis Research Center
The ideal interstellar propulsion system would be one that could get you to other stars as quickly and comfortably as envisioned in science fiction. Before this can become a reality, two scientific breakthroughs are needed: discovery of a means to exceed light speed, and discovery of a means to manipulate the coupling between mass and spacetime. This article explains why these breakthroughs are needed and introduces the emerging possibilities that may eventually lead to these breakthroughs.
R Posted on 1/4/2004 11:10:04 PM
InterstellarTravel Interstellar Travel - Ideas Based On What We Know Warp Drive, When? - Marc Millis, NASA Glenn Research Center
A brief description of some ideas that have been suggested over the years for interstellar travel, ideas based on the sciences that do exist today.
Posted on 1/4/2004 10:19:22 PM
InterstellarTravel Warp Drive, When? Marc Millis, NASA Glenn Research Center
Have you ever wondered when we will be able to travel to distant stars as easily as in science fiction stories? NASA Glenn's Marc Millis, who has taken a break from Project Management for NASA's Breakthrough Propulsion Physics (BPP) Project to return to conducting research, offers this assessment of the prospects for achieving the propulsion breakthroughs that would enable such far-future visions of interstellar travel.
Posted on 1/4/2004 10:16:07 PM
SpeedofLight Light Exceeds Its Own Speed Limit - Or Does It? New York Times, May 30, 2000
The speed at which light travels through a vacuum, about 186,000 miles per second, is enshrined in physics lore as a universal speed limit. Nothing can travel faster than that speed, according freshman textbooks and conversation at sophisticated wine bars; Einstein's theory of relativity would crumble, theoretical physics would fall into disarray, if anything could. Two new experiments have demonstrated how wrong that comfortable wisdom is.
R Posted on 1/4/2004 10:13:22 PM
SpeedofLight Faster than a Speeding Light Wave Physical Review Focus, 19 May 2000
The starship Enterprise routinely flies faster than light, but of course, nothing really goes that fast. Well, almost nothing. Physicists have been concocting light pulses that do travel faster than c (the speed of light in a vacuum) for almost two decades, although none of the experiments could be used to send information that fast, according to most physicists. The latest demonstration, described in the 22 May PRL, may be the most dramatic, as it dispenses with some of the complexities of most other experiments.
R Posted on 1/4/2004 10:07:03 PM
SpeedofLight Light pulses flout sacrosanct speed limit Science News, Vol. 157, No. 24, June 10, 2000
Five years ago, a wave of discontent swept away the 55-mile-per-hour U.S. speed limit. Nowadays, some physicists are taking a hard look at the 670-million-miles-per-hour speed limit of light in a vacuum, or c.
R Posted on 1/4/2004 9:42:24 PM
SpeedofLight Faster-than-Light Laser Pulses?
John G. Cramer, Department of Physics, University of Washington
Can c, the speed limit of the universe, the speed of light in vacuum, be exceeded? In July, 2000, the science-oriented news media were full of reports that pulses of laser light had broken the speed-of-light barrier.
R Posted on 1/4/2004 9:38:36 PM
SpeedofLight Observation of Superluminal Behaviors in Wave Propagation (purchase required) D. Mugnai, A. Ranfagni, and R. Ruggeri - Physical Review Letters, May 22, 2000, Vol. 84, Issue 21
Physicists have been concocting light pulses that travel faster than c (the speed of light in a vacuum) for almost two decades, although none of the experiments could be used to send information that fast, according to most physicists. The latest demonstration, described in the 22 May PRL, may be the most dramatic, as it dispenses with some of the complexities of most other experiments: The light pulses travel through free space--not a highly absorbing material--and their superluminal (faster than light) feat covers a distance of 30 wavelengths, much farther than in any previous work.
Posted on 1/4/2004 8:49:18 PM
InterstellarTravel Warp drive possible BBC News, June 10, 1999
In Star Trek, the USS Enterprise is powered by what is called a "warp drive" and at the moment only Paramount Pictures know its secrets. But new, highly mathematical research may have brought us one step closer to being able to explore the Universe in a starship capable of travelling faster than the speed of light.
R Posted on 1/4/2004 8:25:46 PM
InterstellarTravel SpaceTime Hypersurfing Michael Szpir, American Scientist, Vol. 82
In some future history, 1994 may be remembered as the year that the warp drive was first conceived to be a physical possibility. Long a cliche' of science- fiction writing, the warp drive has transported countless fictional characters through light-years of interstellar space in the time it takes for you or me to travel to the market. Unfortunately for real-world travelers, the warp drive has always been thought to be inconsistent with the laws of physics. But all this has changed.
R Posted on 1/4/2004 7:50:30 PM
SpeedofLight SpaceTime Hypersurfing Michael Szpir, American Scientist, Vol. 82
In some future history, 1994 may be remembered as the year that the warp drive was first conceived to be a physical possibility. Long a cliche' of science- fiction writing, the warp drive has transported countless fictional characters through light-years of interstellar space in the time it takes for you or me to travel to the market. Unfortunately for real-world travelers, the warp drive has always been thought to be inconsistent with the laws of physics. But all this has changed.
R Posted on 1/4/2004 7:50:30 PM
InterstellarTravel The Alcubierre Warp Drive John G. Cramer, Analog Science Fiction and Fact Magazine, 1996
An overview and exploration of Alcubierre's work and its implications. Two years ago Alcubierre published a remarkable paper which grew from his work in general relativity, the current "standard model" for space-time and gravitation. His paper describes a very unusual solution to Einstein's equations of general relativity, described in the title as a "warp drive", and in the abstract as "a modification of space time in a way that allows a space ship to travel at an arbitrarily large speed".
R Posted on 1/4/2004 7:49:15 PM
SpeedofLight The Alcubierre Warp Drive John G. Cramer, Analog Science Fiction and Fact Magazine, 1996
An overview and exploration of Alcubierre's work and its implications. Two years ago Alcubierre published a remarkable paper which grew from his work in general relativity, the current "standard model" for space-time and gravitation. His paper describes a very unusual solution to Einstein's equations of general relativity, described in the title as a "warp drive", and in the abstract as "a modification of space time in a way that allows a space ship to travel at an arbitrarily large speed".
R Posted on 1/4/2004 7:49:15 PM
InterstellarTravel SETI, the Velocity-of-Light Limitation, and the Alcubierre Warp Drive H.E. Puthoff, Ph.D. - Physics Essays, Vol. 9, No. 1, pp. 156-158, 1996
Alcubierre's recent "warp drive" analysis within the context of general relativistic dynamics, indicates the naivete of the assumption of impossibility of faster-than-light-speed travel. We show here that Alcubierre's result is a particular case of a broad, general approach that might loosely be called "metric engineering," the details of which provide yet further support for the concept that reduced-time interstellar travel, either by advanced extraterrestrial civilizations at present or ourselves in the future, is not, as naive consideration might hold, fundamentally constrained by physical principles.
R Posted on 1/4/2004 7:40:58 PM
SpeedofLight SETI, the Velocity-of-Light Limitation, and the Alcubierre Warp Drive H.E. Puthoff, Ph.D. - Physics Essays, Vol. 9, No. 1, pp. 156-158, 1996
Alcubierre's recent "warp drive" analysis within the context of general relativistic dynamics, indicates the naivete of the assumption of impossibility of faster-than-light-speed travel. We show here that Alcubierre's result is a particular case of a broad, general approach that might loosely be called "metric engineering," the details of which provide yet further support for the concept that reduced-time interstellar travel, either by advanced extraterrestrial civilizations at present or ourselves in the future, is not, as naive consideration might hold, fundamentally constrained by physical principles.
R Posted on 1/4/2004 7:40:58 PM
SpeedofLight The Warp Drive: Hyper-Fast Travel Within General Relativity (PDF format) Miguel Alcubierre, Classical and Quantum Gravity, 11 (1994), L73-L77
It is shown how, within the framework of general relativity and without the introduction of wormholes, it is possible to modify a spacetime in a way that allows a spaceship to travel with an arbitrarily large speed. By a purely local expansion of spacetime behind the spaceship and an opposite contraction in front of it, motion faster than the speed of light as seen by observers outside the disturbed region is possible. The resulting distortion is reminiscent of the `warp drive' of science fiction. However, just as happens with wormholes, exotic matter will be needed in order to generate a distortion of spacetime like the one discussed here.
Posted on 1/4/2004 6:59:16 PM
InterstellarTravel The Warp Drive: Hyper-Fast Travel Within General Relativity (PDF format) Miguel Alcubierre, Classical and Quantum Gravity, 11 (1994), L73-L77
It is shown how, within the framework of general relativity and without the introduction of wormholes, it is possible to modify a spacetime in a way that allows a spaceship to travel with an arbitrarily large speed. By a purely local expansion of spacetime behind the spaceship and an opposite contraction in front of it, motion faster than the speed of light as seen by observers outside the disturbed region is possible. The resulting distortion is reminiscent of the `warp drive' of science fiction. However, just as happens with wormholes, exotic matter will be needed in order to generate a distortion of spacetime like the one discussed here.
Posted on 1/4/2004 6:59:16 PM
SpeedofLight Taking A Shot At Einstein U.S. News & World Report, May 26, 2003
Seeking a grander theory, rebel physicists break a cosmic speed limit. As we near the end of our first century in a relative universe, challenges to Einstein's theory are in the air.
R Posted on 1/4/2004 6:46:50 PM
SpeedofLight The Speed-of-Light-Limit Argument Bernard Haisch, Ph.D.
The Leading Theory-Based Rejectionist Argument (which we all know). The speed of light is a universal upper limit. Distances between stars range from 4.3 light years to Alpha Centauri to a hundred thousand light years across the Milky Way galaxy to millions of light years between galaxies. These facts are incompatible with tens of thousands of apparent visitations.
R Posted on 1/4/2004 6:36:33 PM
SpeedofLight Scientists Try to Prove a Higher Speed of Light
Space.com, May 30, 2000
Scientists have long believed nature has a speed limit. It's the speed of light -- 186,000 miles (299,300 kilometers) per second. And the principle that nothing can go faster would mean most science-fiction tales of interstellar travel are impossible. At that speed, it would take us many generations to reach even the closest galaxies. Now, however, physicists are coming closer to finding out how, in some situations, light may actually travel faster than that.
R Posted on 1/4/2004 6:18:25 PM
SpeedofLight Scientists Claim To Break Speed-of-Light Barrier Space.com, July 19, 2000
If zooming beyond the local speed limit is punishable by law, then some scientists may have a gargantuan speeding ticket to pay. In a controversial experiment reported in this week’s journal Nature, scientists at the NEC Research Institute in Princeton, New Jersey claim to have broken the ultimate speed limit -- the speed of light. Though hotly contested, some say this achievement could dramatically increase the speeds at which we can send and receive information.
R Posted on 1/4/2004 6:13:29 PM
SpeedofLight Breaking the Light Speed Limit
Howstuffworks
Once thought to be unbreakable, the speed of light as set by the laws of physics has been exceeded in two recent experiments, according to a New York Times news report.
R Posted on 1/4/2004 6:08:55 PM
