[YAPA] black holes

[Thomas Drummond]

 Hi Norma,

That is an excellent question! And I certainly do not know the answer. 

However, there is a wonderful website called 60 symbols hosted by physicists and chemists at The University of Nottingham.  I have emailed them and they were kind enough to get back to me. You might want to post it to them and they might even do a nice video about it :-)

They also have a video series dedicated to chemistry called Periodic Videos and one for mathematics called Numberphile. 

> On Jun 25, 2016, at 10:55, Norma Holowach <Norma.Holowach at neomin.org> wrote:
> 
> My son is asking the following questions: 
> 
> How can anything fall into a black hole, ever? 
> 
> I ask this question because time dilation at the event horizon is infinite. This means that an object approaching the black hole will need an infinite amount of time to pass the event horizon (time being that of an observer, such as a telescope on Earth, not the proper time of the object falling in). 
> 
> This then leads to the follow up question: how can black holes form, ever? 
> 
> If it takes an infinite amount of time to actually get past the event horizon, how does an event horizon ever form in the first place? Take a collapsing star as an example. Wouldn’t the in-falling matter keep slowing down as time dilation increased towards infinity (from an external observer perspective) and never actually reach the density required to form a black hole? 
> 
> Am I missing something? Please help!
> 
> 
> Norma Holowach, M.Ed 
> National Board Certified Teacher 
> Science Department Chairperson 
> Lakeview High School 
> 300 Hillman Drive 
> Cortland, OH 44410 
> (330)637-4921 
> "Connecting with nature is an essential part of being alive." 
> National Geographic. 
> 
> 
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