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Black holes and starry skies

How do you measure a black hole? In this video Astronomy Professor Karl Gebhardt weighs in on the cosmic matter.

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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