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We do not doubt that the speed of light in a vacuum is always the same. It is said that it cannot be otherwise. However, this opinion is not based on direct measurements.
Always the same speed of light in different circumstances without measurements can only be understood as an assumption (hypothesis), perhaps as a postulate. However, an assumption cannot be the basis of scientific views: science is consistently based on measurements.
In the following, there is a description of the measurement of the speed of light where the light comes from a comet. The measurement shows that the speed of the comet affects the speed of light. Therefore, the measurement does not confirm always-the-same speed of light.
Therefore, science fatally neglects measurements of the speed of light, thereby denying the scientific view of the speed of light that many have long been awaiting.
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