Ever since I was a child I have had this instinctive urge for expansion and growth. To me, the function and duty of a quality human being is the sincere and honest development of one’s potential. -Bruce Lee
It isn’t only our heros that expand and grow; the Universe does that, too! In the first three parts of our series, we talked about inflation, its end, and the hot big bang. But during all of this time, the Universe has been expanding.

This is probably the most confusing aspect of cosmology, so tread slowly through this. First off, it is space itself that is expanding. It doesn’t make sense to ask “what’s it expanding into?” Because space is like the surface of an infinitely stretchy balloon: it can get bigger or smaller, but it doesn’t require anything external to itself.

Now, one of the biggest thing that we [...]

Original post by Ethan Siegel none@example.com