Quote:
Originally Posted by mugaliens
[snip]
It's probably a perceptual/conception thing on my part, but my brain finds it difficult to perceive how black holes, which weigh much less than the entire universe, can exist, while when you put all the mass of the universe in a space the size of a marble, it someone fails to collapse into a black hole, and instead, this quark soup expands.
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Ah well, would you be interested in seeing how GR, when applied to the universe, produces a Big Bang?
There are quite a few websites where this is explained, at varying levels of detail (and math!) -
Sean Carroll's Cosmology Primer may be a good place to start, or
this resources page of his.