Radioactivity surely existed. The question about dating is the assumptions that are made about the amount of decayed isotope in the material before the dating is conducted.Radioactivity now exists. I have not seen proof it existed in the early history of earth. Has anyone else found proof or evidence for that? As it stands....I doubt it!
First, the assumption is that all the matter in the universe started in an undecayed state. Yet, we have no proof that the universe contained only undecayed material at its beginning.
Secondly, the time of decay is predicated on the notion that the speed of light was constant, or, that the speed at which the universe aged was constant. However, cosmologists don't know what is the maximum speed at the fabric of space can expand, and, in this light (no pun intended) the speed of matter going across the universe was traveling much greater than the speed of light since the universe was compressed. In other words, the speed of light should be pro rated to account for the fact that the universe and all matter in was compressed into a small space.
As the universe expands, the light is stretched along with it, and this actually alters the calculations of the "constant" speed of light (which is not a factor included in the dating of materials).
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