Obsolete scientific theories | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-01-18

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Superseded_theories_in_science


00:02:17 1 Superseded theories
00:02:48 1.1 Biology
00:06:49 1.2 Chemistry
00:08:06 1.3 Physics
00:11:41 1.4 Astronomy and cosmology
00:13:28 1.5 Geography and climate
00:14:49 1.6 Geology
00:16:09 1.7 Psychology
00:16:42 1.8 Medicine
00:17:53 2 Obsolete branches of enquiry
00:18:20 3 Theories now considered incomplete
00:20:23 4 See also
00:20:55 4.1 Lists



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SUMMARY
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In science, a theory is superseded or becomes obsolete when a scientific consensus once widely accepted it, but current science considers it an inadequate, incomplete, or simply false description of reality. Such labels do not cover protoscientific or fringe science theories that have never had broad support within the scientific community. Furthermore, superseded or obsolete theories exclude theories that were never widely accepted by the scientific community. Some theories that were only supported under specific political authorities, such as Lysenkoism, may also be described as obsolete or superseded.
All of Newtonian physics is so satisfactory for most purposes that it is more widely used except at velocities that are a significant fraction of the speed of light, and simpler Newtonian but not relativistic mechanics is usually taught in schools. Another case is the belief that the Earth is approximately flat. For centuries, people have known that a flat Earth model produces errors in long-distance calculations, but considering local-scale areas as flat for the purposes of mapping and surveying does not introduce significant errors.
In some cases, a theory or idea is found baseless and is simply discarded. For example, the phlogiston theory was entirely replaced by the quite different concept of energy and related laws. In other cases an existing theory is replaced by a new theory that retains significant elements of the earlier theory; in these cases, the older theory is often still useful for many purposes, and may be more easily understood than the complete theory and lead to simpler calculations. An example of this is the use of Newtonian physics, which differs from the currently accepted relativistic physics by a factor that is negligibly small at velocities much lower than that of light.