A black hole half a meter across would mass more than the entire Earth.
Earth converted to a black hole would be about a centimeter across;
Jupiter, I believe, would be six meters. So register me as going with
firstname.lastname@example.org Eliezer S. Yudkowsky http://pobox.com/~sentience/tmol-faq/meaningoflife.html Running on BeOS Typing in Dvorak Programming with PatternsVoting for Libertarians Heading for Singularity There Is A Better Way