Why is helium running out?
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Scientists estimate that 99% of the helium on Earth is formed by radioactive decay. So, if uranium is constantly emitting helium, which it most assuredly is, you might wonder why helium reserves are running low. The answer lies with the notoriously long half-lives of the elements that give us helium.
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Though extremely abundant in space, the helium that we use in our daily lives can be found in a few much more terrestrial, and limited, sources. Helium is so much more abundant in space because it is lighter than other gases in the atmosphere, which means that there is nothing stopping it as it travels into space.
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