&gt; Black holes (...) take infinite time to form<p>This is wrong, and based on not taking into account that in GR, simultaneity is not only a relative thing, but also a local thing. There is much more detail in several great answers to this Stack Exchange question:<p><a href="http:&#x2F;&#x2F;physics.stackexchange.com&#x2F;questions&#x2F;5031&#x2F;can-black-holes-form-in-a-finite-amount-of-time" rel="nofollow">http:&#x2F;&#x2F;physics.stackexchange.com&#x2F;questions&#x2F;5031&#x2F;can-black-ho...</a>