A small correction.

The following is unsafe, because #Universe can be already defined
within local environment:

Packages addPackage: #Universe !   " a "
Universe addNamespace: #Earth !  " b "

So, it should be done differently, like following:

!(Packages addPackage: #Universe) beDefaultScope!
   .. here the subchunk with properly set scope.

!

-- 
Best regards,
Igor Stasenko AKA sig.