The answer depends on whether other natural constants would change at the same time. If the speed of light alone were to change, it would affect the structure of atoms and, at the same time, the composition of the entire universe.
If we assume that all natural constants would change in the same proportion, the change in the speed of light would be reflected mainly in our own definitions. Half the speed of light would mean that light would travel from the Sun to Earth in 16 minutes instead of the current 8 minutes. The meter would also be half as short. A meter is defined as the length of light that travels in a fraction of a second.
A surprising change in the speed of light would also confuse gps positioning based on the time the signal travels from the satellite to the receiver.
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Defendant: Talvikki Hovatta
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Academy Research Fellow and Docent of Astronomy, University of Turku.
Published in Science 1/2022.
Source: Tiede by www.tiede.fi.
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