ASTRONOMY: Odd company

Fulvio, Melia

Fulvio Melia is in the Departments of Physics and Astronomy, The University of Arizona, Tucson, Arizona 85721, USA. e-mail: [email protected]

Nature 437(7062):p 1105, October 20, 2005.

Black holes cannot yet be seen directly, but their influence on surrounding stars is allowing them to be identified with increasing certainty. That those stars are there to be influenced, though, raises other questions.