According to this article, there is a large quantity of Helium in space (stars), but very little is accessible to us on Earth:

Helium is abundant in space, where it's produced as a product of the fusion reaction inside stars such as the sun. The naturally occurring helium on Earth, though, comes from a different sort of process.

This might sound silly, but I could not find information about why we have so few Helium "trapped" on (inside) Earth since it is abundant in space during the birth of the planet.

Note: I am mostly referring to Helium-4, as the shortage seems to be different depending on the isotope as explained here.

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    $\begingroup$ Abundant in space, or abundant inside of stars? Helium on Earth can escape the atmosphere, and since it doesn't chemically bind up (like hydrogen) it often ends up there. Thank goodness for alpha decay, or we would not have party balloons. $\endgroup$ – Jon Custer Aug 7 at 14:44
  • $\begingroup$ @JonCuster - in space means "outside Earth". Clearly in stars is more precise. $\endgroup$ – Alexei Aug 7 at 15:15
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    $\begingroup$ Helium should be abundant not only inside the stars but also generally in the clouds that both stars and planets form from, so I think it is a very good question where it all went. $\endgroup$ – Thriveth Aug 8 at 10:44

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