Karl Gebhardt, the Herman and Joan Suit Professor of Astrophysics, uses data collected from an innovative instrument at the McDonald Observatory called the VIRUS-P to measure the size of the most massive known black hole in our cosmic neighborhood.
Related content:
- Read more about measuring black holes on the McDonald Observatory Web site.
- Cosmic time machine: The Giant Magellan Telescope will help astronomers demystify dark matter, probe black holes in distant galaxies and study planets around other stars – February 2011




















Hi Karl I still don't understand how you find these black holes even if you are not sure they are black holes. I am intrigued by by their concept but they have always confused me. You have made the comment that you don't know if black holes are black holes. This is why I am confused. Can you recommend somewhere I can go to [web site] where I can learn more about this. I would appreciate it if you could suggest a good resource. Thanks.