Business Download Hyperion Intelligence Explorer 8' title='Business Download Hyperion Intelligence Explorer 8' />Analyst Gerry Brown explains content intelligence a combination of business intelligence software and content management that helps companies leverage. Interstellar travel Wikipedia. A Bussard ramjet, one of many possible methods that could serve as propulsion for a starship. Interstellar travel is the term used for hypothetical crewed or uncrewed travel between stars or planetary systems. Interstellar travel will be much more difficult than interplanetary spaceflight the distances between the planets in the Solar System are less than 3. AUwhereas the distances between stars are typically hundreds of thousands of AU, and usually expressed in light years. Because of the vastness of those distances, interstellar travel would require a high percentage of the speed of light huge travel time, lasting from decades to millennia or longer or a combination of both. The speeds required for interstellar travel in a human lifetime far exceed what current methods of spacecraft propulsion can provide. Even with a hypothetically perfectly efficient propulsion system, the kinetic energy corresponding to those speeds is enormous by todays standards of energy production. Moreover, collisions by the spacecraft with cosmic dust and gas can produce very dangerous effects both to passengers and the spacecraft itself. A number of strategies have been proposed to deal with these problems, ranging from giant arks that would carry entire societies and ecosystems, to microscopic space probes. Many different spacecraft propulsion systems have been proposed to give spacecraft the required speeds, including nuclear propulsion, beam powered propulsion, and methods based on speculative physics. For both crewed and uncrewed interstellar travel, considerable technological and economic challenges need to be met. Even the most optimistic views about interstellar travel see it as only being feasible decades from nowthe more common view is that it is a century or more away. However, in spite of the challenges, if interstellar travel should ever be realized, then a wide range of scientific benefits can be expected. Most interstellar travel concepts require a developed space logistics system capable of moving millions of metric tons to a construction operating location, and most would require gigawatt scale power for construction or power such as Star Wisp or Light Sail type concepts. Such a system could grow organically if space based solar power became a significant component of Earths energy mix. Consumer demand for a multi terawatt system would automatically create the necessary multi million metric tonyear logistical system. ChallengeseditInterstellar distanceseditDistances between the planets in the Solar System are often measured in astronomical units AU, defined as the average distance between the Sun and Earth, some 1. Venus, the closest other planet to Earth is at closest approach 0. AU away. Neptune, the farthest planet from the Sun, is 2. AU away. As of July 2. Voyager 1, the farthest man made object from Earth, is 1. AU away. 4The closest known star Proxima Centauri, however, is some 2. AU away, or over 9,0. Neptune. Because of this, distances between stars are usually expressed in light years, defined as the distance that a ray of light travels in a year. Essbase is a multidimensional database management system MDBMS that provides a multidimensional database platform upon which to build analytic applications. Introducing Oracle Business Intelligence Enterprise Edition. This chapter describes how to get started with Oracle Business Intelligence Enterprise Edition and. Business Download Hyperion Intelligence Explorer TrainingBetween the Lines. Larry Dignan and other IT industry experts, blogging at the intersection of business and technology, deliver daily news and analysis on vital. Throwing things out of anger is never a smart move, but it can also lead to more serious consequences. Especially when youre at an airport and what youre. Light in a vacuum travels around 3. AU in a year. Proxima Centauri is 4. Another way of understanding the vastness of interstellar distances is by scaling One of the closest stars to the Sun, Alpha Centauri A a Sun like star, can be pictured by scaling down the EarthSun distance to one meter 3. On this scale, the distance to Alpha Centauri A would be 2. The fastest outward bound spacecraft yet sent, Voyager 1, has covered 16. At this rate, a journey to Proxima Centauri would take 8. Required energyeditA significant factor contributing to the difficulty is the energy that must be supplied to obtain a reasonable travel time. A lower bound for the required energy is the kinetic energy. K1. 2mv. 2displaystyle Ktfrac 12mv2 where mdisplaystyle m is the final mass. If deceleration on arrival is desired and cannot be achieved by any means other than the engines of the ship, then the lower bound for the required energy is doubled to mv. The velocity for a manned round trip of a few decades to even the nearest star is several thousand times greater than those of present space vehicles. This means that due to the v. Accelerating one ton to one tenth of the speed of light requires at least 4. This energy has to be generated on board from stored fuel, harvested from the interstellar medium, or projected over immense distances. Interstellar mediumeditA knowledge of the properties of the interstellar dust and gas through which the vehicle must pass is essential for the design of any interstellar space mission. A major issue with traveling at extremely high speeds is that interstellar dust may cause considerable damage to the craft, due to the high relative speeds and large kinetic energies involved. Various shielding methods to mitigate this problem have been proposed. Larger objects such as macroscopic dust grains are far less common, but would be much more destructive. The risks of impacting such objects, and methods of mitigating these risks, have been discussed in the literature, but many unknowns remain 1. Sun, will depend on direction travelled. Although a high density interstellar medium may cause difficulties for many interstellar travel concepts, interstellar ramjets, and some proposed concepts for decelerating interstellar spacecraft, would actually benefit from a denser interstellar medium. HazardseditThe crew of an interstellar ship would face several significant hazards, including the psychological effects of long term isolation, the effects of exposure to ionizing radiation, and the physiological effects of weightlessness to the muscles, joints, bones, immune system, and eyes. There also exists the risk of impact by micrometeoroids and other space debris. These risks represent challenges that have yet to be overcome. Wait calculationeditIt has been argued that an interstellar mission that cannot be completed within 5. Instead, assuming that a civilization is still on an increasing curve of propulsion system velocity and not yet having reached the limit, the resources should be invested in designing a better propulsion system. This is because a slow spacecraft would probably be passed by another mission sent later with more advanced propulsion the incessant obsolescence postulate. On the other hand, Andrew Kennedy has shown that if one calculates the journey time to a given destination as the rate of travel speed derived from growth even exponential growth increases, there is a clear minimum in the total time to that destination from now. Voyages undertaken before the minimum will be overtaken by those who leave at the minimum, whereas those who leave after the minimum will never overtake those who left at the minimum. Prime targets for interstellar traveleditThere are 5. Sun, containing 8. The following could be considered prime targets for interstellar missions 1. System. Distance lyRemarks. Alpha Centauri. 4. Closest system. Three stars G2, K1, M5. Component A is similar to the Sun a G2 star. On August 2. 4, 2. Earth size exoplanet orbiting in the habitable zone of Proxima Centauri was announced. Barnards Star. 6Small, low luminosity M5 red dwarf. Second closest to Solar System. Sirius. 8. 7. Large, very bright A1 star with a white dwarf companion. 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Harvard Business Review article on Lean here. My free online Lean Launch. Pad class on Udacity is here. All the Lectures and their subtitles can be download for free here. Creative Commons license applies. I also share all my syllabi, student presentations and my class lectures slides as well. Educators Training Guide is here. Course for Educators is here. Teachable moments videos for the Lean Launchpad class here. How do Customer Discovery videos here. How to do Customer Discovery workbook here. Sample Lean Launch. Pad Lecture slides and suggested syllabus here. Latest presentations posted click here. Latest student videos posted here. National Science Foundation presentations here. Stanford presentations, lectures and syllabus here. Berkeley presentations, lectures and syllabus here. Columbia 5 day presentations, lectures and syllabus here. Caltech 5 day presentations, lectures and syllabus here. Business Model Competition slides here. 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