Is the speed of light decreasing? I've heard It is.
The idea of the speed of light decreasing is not supported by current scientific evidence. According to our current understanding of physics, the speed of light in a vacuum is constant and does not change.
The concept that the speed of light might decrease over time is based on a hypothesis known as the "tired light" theory, which was proposed in the early 20th century. However, this theory is not widely accepted by the scientific community because it conflicts with a large body of experimental evidence and the principles of modern physics.
To gather more information about scientific theories, it is always a good idea to consult reliable sources such as scientific journals, books written by experts in the field, or reputable scientific websites. These sources will provide you with up-to-date and well-vetted information on various scientific topics.