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helium

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In so-called dry magnets, coolers are used so that no cryoliquid is needed at all or for the recondensation of the evaporated helium. en.wikipedia.org

This would particularly be the case if the early helium-4 abundance was much smaller than 25% because it is hard to destroy helium-4. en.wikipedia.org

These spectra contain quantitative information on all major elements in the samples except for hydrogen, helium and lithium. en.wikipedia.org

Hydrogen burning continues in the stars shell, producing helium ash that falls into the core. en.wikipedia.org

More massive stars spend an extended time on the horizontal branch and show a larger increase in temperature as they burn helium in the core. en.wikipedia.org

Proceeding outward, there is an oxygen-burning shell, followed by the neon shell, the carbon shell, the helium shell, and the hydrogen shell. en.wikipedia.org

Generally a cryocooler, also known as a coldhead, is used to recondense some helium vapor back into the liquid helium bath. en.wikipedia.org

Most of a stars mass consists of light hydrogen and helium. en.wikipedia.org

The reserve was expected to run out of helium in 2018. en.wikipedia.org

The splitting of the lithium nuclei produced helium nuclei. en.wikipedia.org

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