I started it because I had accumulated masses of material while researching my book, and a blog seemed a good way to share this. (allysonlatta.ca)
At that age, a cluster would not yet have had much time to accumulate mass by the pull of its gravity; El Gordo's extreme size is at the very limit of what current cosmology models can explain. (discovermagazine.com)
From early Earth history, the continental crust (Earth's thick solid outer skin that we live on) has accumulated mass from the underlying hot mantle. (sciencedaily.com)