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STT
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No, any stable thing doesn’t have any tendency for change.Energy, unstable or otherwise, is changing.
Things are constantly changing as we can justify it from observing reality. Unstable energy just existed at the initial point.If unstable energy is a necessary act of existence, then it is always changing.
Existence has a beginning and it is subject to change as time dictates.It does not have a beginning or starting point. The same logical implications apply.