Uploaded June 2021 | Updated September 2026, 1 hour ago
As the population density of urban areas has increased, so has the need for buildings that rise rather than spread. As a result, the construction of skyscrapers, high-rises, or tall structures has increased with the advent of advanced engineering capabilities. But what is the definition of a skyscraper?
Any structure that rises to a significant or noticeable height is considered a tall building. In other words, tall buildings are subjective to where they reside. A tall building in one city may not be considered tall, in another. There is in fact a threshold for tall buildings as many classify any structure that reaches the height of 50 meters (165 feet) as a tall building.
As the population density of urban areas has increased, so has the need for buildings that rise rather than spread. As a result, the construction of skyscrapers, high-rises, or tall structures has increased with the advent of advanced engineering capabilities. But what is the definition of a skyscraper?
Any structure that rises to a significant or noticeable height is considered a tall building. In other words, tall buildings are subjective to where they reside. A tall building in one city may not be considered tall, in another. There is in fact a threshold for tall buildings as many classify any structure that reaches the height of 50 meters (165 feet) as a tall building.








![Information Mastery (Alternate Kardashev Scale) | Introduction
The Kardashev Scale is one of the most popularized way to determine a civilization’s ranking and advancements in whatever universe they reside in. Nikolai Kardashev introduced his scale first in 1964, however, this scale has been modified and tweaked by many different cosmologists, astrophysicists, and even science fiction authors over many years. Some of the more popular alternative approaches to the Kardashev Scale include Microdimensional Mastery by John Barrow, Planetary Mastery by Robert Zubrin, and Information Mastery by Carl Sagan. Today, our focus will be on the Information Mastery version of the Kardashev scale.
In his book, The Cosmic Connection, Carl Segan proposed an alternative approach to the Kardashev Scale. He added another dimension to the original scale in addition to the pure energy usage that was first used to characterize different civilizations. Sagan believed that the amount of information available to civilization should be an important criterion when trying to come up with a useful metric to measure different types of civilizations. So he assigned a lettered scale from A-Z where each letter meant an order of magnitude increase in the volume of information a civilization can hold. This information, he proposed, could be described in terms of bits, the number of yes or no statements concerning different civilizations, and the universe that such civilizations occupy. He started with a Type A civilization that he believed would have access to about 10^6 bits of unique information available to it. According to Carl Sagan, this civilization type would be extremely primitive and less than any recorded civilization in human history. On the other end of the scale though, a Type Z civilization, he argued, would have about 10^31 unique bits of information available to it, making it the most highly advanced civilization in its universe. One thing to be aware of here is that for a civilization to advance to higher stages on this scale, it must add unique bits of information to its preexisting knowledge. For example, information is counted if a brand new technology is invented or an already existing technology is innovated. Moreover, it is important to keep in mind that the information and energy axes are not strictly interdependent here as well. This means that even a Type Z civilization would not need to be a Type 3 civilization on the original Kardashev Scale. It could be more or less advanced than a type 3 because the focus of the Information Mastery Scale is on the amount of unique information a civilization possesses. So, In general, Carl Sagan believed that a civilization that is high on the energy scale could also be high on the information scale. But this does not necessarily have to be true. The reason for this is because Sagan argued that “[we] certainly can imagine societies that are very complex and require many more bits to characterize them than our society requires – but that are not interested in interstellar communication”. This means a highly advanced civilization with numerous bits of information wouldn’t necessarily want to expand outwards in its universe classifying it lower in terms of the original energy usage criterion of the Kardashev Scale. An example of this might be a highly developed civilization like the Autobots and Decepticons from Transformers who reside on Cybertron, a highly advanced planet, but do not venture out into space to colonize any other planets or star systems. This is the key difference between Nikolai Kardashev’s original idea and Carl Sagan’s interpretation of it. Information Mastery (Alternate Kardashev Scale) | Introduction](https://i.ytimg.com/vi/nCJiLhFkMLU/mqdefault.jpg)

