[rjbemsha]

"The question now becomes, does the helium originate from inside the moon, for example, due to radioactive decay in rocks, or from an exterior source, such as the solar wind?" says Dr Alan Stern, LAMP principal investigator.

[Captain Beyond]

bflr

[fieldmarshaldj]

So that means everyone sounds like the Chipmunks on the moon ?

[kidd]

The presence of helium in the moon’s (very) thin atmosphere has been known since the moon landings.

[Thorliveshere]

I knew it! I knew that all of my balloons when I was a child floated up to the moon!!! :D

[zeugma]

"The question now becomes, does the helium originate from inside the moon, for example, due to radioactive decay in rocks, or from an exterior source, such as the solar wind?" says Dr Alan Stern, LAMP principal investigator.

I'd bet on the former. 

How many millibars of atmosphere does the moon actually have? It's generally referred to as 'airless', but any body as large as the moon will have some trace atmosphere due to gravity.