Well, I can think of three possibilities, ranging from the highly unlikely thru the downright weird to the unashamedly speculative.
Our models of planet formation are dead wrong. Instead of taking millions of years, maybe it just takes dozens.
This star is a freak and there'll never be another one that behaves anything like this.
(Unlikely, improbable and really weird, if that's true!)
All the dust (several planet's worth!) has been rapidly hoovered up by von Neumann probes... http://en.wikipedia....n_probes</span>
...for purposes known only to their makers.
Any other offers?
Edited by bornagainathiest, 11 July 2012 - 04:23 PM.