I'm a bit confused from all of this. Have many of you read Michio Kaku's explanations in
Hyperspace and
Parallel Worlds?
In
Parallel Worlds, Michio Kaku explains that physicists sometimes use these classifications in correlation to a civilization's energy consumption and the laws of thermodynamics.
A Type I civilization is classified as a civilization which can harness planetary forms of energy, especially that "they are able to utilize the entire amount of solar energy striking their planet, or 10^16 watts."
A Type II civilization is classified as a civilization which has exhausted the energy attainable on their planet and has therefore moved on to harnessing and extracting the energy produced from their star. "They are able to consume the entire energy output of their star and might conceivably control solar flares and ignite other stars." From there, they may also utilize other planets in their solar system as power sources.
A Type III civilization is classified as a civilization which has exhausted the attainable energy from their solar system and has therefore moved on to extracting energy from farther reaches of their galaxy, including extraction from many stars and solar systems.
Concerning timetables:
Although the gap separating these civilizations may seem astronomical, it is possible to estimate the time it might take to achieve a type II civilization. Assume that a civilization grows at a modest rate of 2 to 3 percent in its energy output per year. (This is a plausible assumption, since economic growth, which can be reasonable calculated, is directly related to energy consumption. The larger the economy, the greater its energy demands. Since the growth of the gross domestic product, or GDP, of many nations lies within 1 to 2 percent per year, we can expect its energy consumption to grow at roughly the same rate.)
Of course, this rate stated here may oscillate depending on many factors, including politics, wars, terrorism, etc. But such an estimation can be made from tracked records of growth. And if nothing deviates from this path, it may be reasonable to assume this steady progression will continue.
Michio Kaku describes our current civilization as a Type 0.7 civilization since we are not yet a planetary civilization. We are still relying on dead plants and animals as
the primary source of energy for our daily activities. Though, there are certainly signs of us growing into a more planetary culture, which will usher into the new era of actually harnessing the planet's available energy resources (solar energy, hydrogen fuel, wind, nuclear reactions, etc). Michio Kaku lists several key elements of this developing unitary planet.
*The Internet is an emerging type I telephone system...
*The language of our type I society will probably be English...
*Nations, although they will exist in some form for centuries to come, will become less important, as trade barriers fall and the world becomes more economically interdependent... No single nation is powerful enough to stop this march to a type I civilization.
Michio Kaku continues with more examples of how this planetary culture is already evolving before our eyes, then goes to further describe each type of civilization in further detail of how they may operate. (Do remember that predictions of the future are
not completely speculative, but are based on physical and economic principles. Although predicting things in the far-off future is certainly far-flung, there are restrictions on what any civilization can do and what they cannot do despite any sort of advance they may muster. Timetables are more or less set alongside cultural development, which includes the growth of the economy and political barriers.)
From there, Michio Kaku goes to explain what a Type IV civilization might be in terms of energy consumption. He speculates that:
If a type IV civilization could exist, its energy source might be extragalactic, such as the dark energy we see around us, which makes up 73 percent of the matter/energy content of the universe...
But by the laws of physics, it is still conceivable that an advanced type III civilization, having exhausted the power of the stars in the galaxy, may somehow try to tap into this energy to make the transition to type IV.
Furthermore, Dr. Kaku also explains some refinements to this classification system. One is based on information processing efficiency, while another, by Carl Sagan, is based on a civilization's information content, with a scale from A to Z.
A type A civilization, for example, is one that processes 10^6 bits of information. This would correspond to a primitive civilization without a written language but with a spoken language...
Once a written language is discovered, the total information content rapidly explodes...
Sagan estimated our present-day information content. By estimating the number of books contained in all the libraries of the world (measured in the tens of millions) and the number of pages there are on each book, he came up with about 10^13 bits of information. If we include photographs, this might rise to 10^15 bits. This would place us as a type H civilization. Given our low energy and information output, we can be classified as a type 0.7 H civilization.
Also, Michio Kaku explains what a "photonic drive" is in
Visions:
A design called the photonic engine is basically a powerful laser which uses light pressure to propel itself into space.
bd1976 said:
Currently the only possible mechanism for exploration of the galaxy
Only possible mechanism? There are many mechanisms that have been proposed in relation to colonization of space, such as using nano bots with encoded information to spread to planets, terraform the planet, then fuse elements and facilities to instigate cell replication and human growth. Cryogenics and suspended animation is another option. Manipulating gravity to use hyperdrives or warp drives (they are different things) would work. There's also speculation of manipulating probabilities with an "Infinite Improbability Drive" like in the famed Heart of Gold starship in
The Hitchhiker's Guide to the Galaxy.
In the Hitchhiker's Guide to the Galaxy, the bestselling irreverent, wacky science fiction novel by Douglas Adams, the hero stumbles upon a most ingenious method of traveling to the stars. Instead of using wormholes, hyperdrives, or dimensional portals to travel between galaxies, he conceives of harnessing the uncertainty principle to dart across the vastness of intergalactic space. If we can somehow control the probability of certain improbable events, then anything, including faster-than-light travel, and even time travel, is possible.
selfAdjoint said:
When was the last time a new scientific idea made a difference in our daily lives?
That depends on what you mean by "new". The Internet is relatively "new" and has had an enormous impact on people's daily lives. High-speed internet "new" and is starting to increasingly impact the way the internet works. (Webmasters aren't as afraid to display large data amounts since http://livescience.com/technology/ap_050707_broadband_use.html .) There are certainly new ideas in the works which will greatly impact how people work in the future. Quantum computers, fiber optics, nanomachines, biometrics, stem-cell research, renewable energy, commercial space travel, and much more will greatly impact society in decades to come.