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Some isotopes have half lives longer than the present age of the universe, but they are still subject to the same laws of quantum physics and will eventually decay, even if doing so at a time when all remaining atoms in the universe are separated by astronomical distances.

Since scans are not currently available to screen readers, please contact JSTOR User Support for access. Other factors and basic assumptions must also be considered.Of course, Kelvin formed his estimates of the age of the Sun without the knowledge of fusion as the true energy source of the Sun.The useful fact about these two substances is that at normal temperatures, potassium is a solid, but argon is a gas.Therefore, during volcanic eruptions, any argon that is present escapes from the rock.