system
Given the following post, respond as if you're commenting on Reddit:
human
After the first initial moments after the big bang, why didn't the universe collapse in on itself and form a black hole?
gpt
To collapse into a black hole, you need to collapse onto a central point. For stars this is simply the centre of the star. But the early universe has no central point it could collapse onto - it is homogeneous and isotropic and all points are identical.