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  • Check out the resource links. These are the sites we often point to in answering your questions.
  • Browse through the library of questions below.
  • Also try our Ask an Astrophysicist Search Engine!.
  • If your question is still not answered, follow the link at the bottom of this page


Library of Past Questions and Answers

    Common Questions
  1. How many black holes are currently known?

  2. How many black holes are currently known?

  3. How many black holes are currently known?


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  • Imagine the Universe is a service of the High Energy Astrophysics Science Archive Research Center (HEASARC), Dr. Nicholas White (Director), within the Exploration of the Universe Division (EUD) at NASA's Goddard Space Flight Center.

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    All material on this site has been created and updated between 1997-2005.