User: John Baez

Grovelling apology

On: Thrust from Microwaves - The Relativity Drive

You can find the flaming here and the grovelling apology on their blog.

Re:Nice visual demonstration that dark matter exis

On: Astronomers Make Important Dark Matter Discovery

Good work! I've put up some more links to Markevitch's work here, and a simplified explanation of this colliding galaxy business:

This Week's Finds, Week238

I'm not an expert on this, so some of the details could be wrong. I'll fix them if corrected (please send email).