# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2011-12-28 18:28:56 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/152093693006974976) @ProfBrianCox With the exclusion principle in place, how do stars manage to collapse into black holes? Great programme BTW thank you.