system
Given the following post, respond as if you're commenting on Reddit:
human
Where does helium go?

We know that helium rises because it is lighter than most of the atmosphere. However, it should still be held around the earth due to gravity. So, is there a region of the atmosphere that is mostly helium or has a greater concentration of it, or does something else happen to it once it reaches higher altitudes?
gpt
Helium is so light and inert that it is eventually blown away by solar wind, earth’s gravity isnt enough to hold it. The only reason we still have it on earth is because its generated through radioactive decay and can be trapped underground along with natural gas.

Ultimately it ends up dispersed in space, where it is the second most abundant element after hydrogen.