<P> The abundance of helium - 3 is thought to be greater on the Moon than on Earth , having been embedded in the upper layer of regolith by the solar wind over billions of years , though still lower in abundance than in the solar system 's gas giants . </P>
<P> The abundance of helium - 3 is thought to be greater on the Moon than on Earth , having been embedded in the upper layer of regolith by the solar wind over billions of years , though still lower in abundance than in the solar system 's gas giants . </P>
where is helium 3 found on the moon
where is helium 3 found on the moon
embedded in the upper layer of regolith
embedded in the upper layer of regolith