MsM....Road has pretty much summed it up... as you can infer from his explanation its a far from cut and dried theory.... and I understand that Hawkings latest comments have caused quite a lot of head shaking in physicist circles. I think that Hawking is not quite proposing white holes in the strictest sense of the term but thats pretty much what it amounts to (with some modifcations to the white hole theory). I'm still trying to track down a transcript of his full speech so I can get a better grip on what he's saying.

Incidentally... MsM a quick run down on white holes/ wormholes can be found here

http://curious.astro.cornell.edu/que...php?number=108
and here
http://casa.colorado.edu/~ajsh/schww.html

Z