It's not just a good idea, it's the law.
In the last 15 years quantum physicist have been showing the speed of light slowing. This has been documented up until 1967. In 1967 the second was redefined from orbital to so many oscillations of the cesium 133 atom. With the "new second" the orbital velocities of Venus, Mercury and Mars have been shown to be increasing. (So much for the second law of thermodynamics.)
In other words, settled science is still unsettled, just as it should be.