SL Youtube: Lecture on Dark Matter by Dr. Knop

"How we know that Dark Matter Exists. Dr. Robert A. Knop, also known as Prospero Frobozz, delivers his talk on Dark Matter. Presented at the Meta Institute for Computational Astrophysics in Second Life as part of the Ask an Astronomer series on 2 May 2009. Witness education in action."

Filmed by Geo Meek of Pookymedia on May 2, 2011.