The metric expansion of space is the increase of the distance between two distant parts of the universe with time (…). It is an intrinsic expansion whereby the scale of space itself changes. This is different from other examples of expansions and explosions in that, as far as observations can ascertain, it is a property of the entirety of the universe rather than a phenomenon that can be contained and observed from the outside.
Watchfolio: "Teenage" tag
The mission: Exterfolio 2014
Where do we stand: Dashfolio 2015
WordPress: Q&A Matrix