# For a distant observer can a black hole form and grow in finite time? [duplicate]

Consider an observer at a significant distance away from a collapsing star.

As such when a singularity is born at the core of the star the observer would never see it grow anymore than the infinitesimal point it is at the moment of its creation.

This is because the gravitational time dilation at its event horizon would mean any infalling matter would take infinite time to cross the horizon with respect to observers time.

Keep in mind the observer is away from the star and not inside it as answers to similar questions had falsely assumed that otherwise. So the time dilation for the two would be different.

If this is true no Black hole should technically exist for people at earth as the time required for a blackhole to grow from singularity to things like supermassive blackhole at galactic centers would take infinite time from earth's perspective.

Finally this should mean there are only two ways for them exist

1. If all matter or the universe itself came out of black hole as only in that case we would have equal dilation leading to their formation in finite time

2. Universe existed since near forever (eternal) .

## marked as duplicate by tparker, Qmechanic♦Dec 28 '16 at 6:13

• Possible duplicate of How can anything ever fall into a black hole as seen from an outside observer? – tparker Dec 27 '16 at 23:37
• Please do not flag for duplicate if the similar question have answers that completely fails to understand the question. Having a answer doesn't means it's correct. – user1062760 Dec 28 '16 at 18:41
• Those other question seem to understand the question to me – tparker Dec 28 '16 at 18:46
• @tparker well if you notice the answers to one of them make the wrong assumption that observer is inside Black hole while that question itself States "distant observer". The other one has a answer that does not exactly clarify and is found unacceptable by some as you can see in the comments it also has drastically less upvotes to another answer of it which makes unsaid assumptions again. – user1062760 Dec 28 '16 at 19:01
• Please edit your question if you think this is not a duplicate, making explicit what about your question is different to the other ones already asked. If you are merely not satisfied with the answers to the previous questions, you might consider offering a bounty on them requesting additional clarification instead. – ACuriousMind Dec 29 '16 at 3:27