Sky & Telescope May 2011 Print Issue
Planets spin. Stars spin. Even entire galaxies spin. But what about black holes? As Harvard astronomer Laura Brenneman explains in the cover story of the May 2011 issue of Sky & Telescope, even these ultimate cosmic whirlpools spin on an axis. Some black holes spin at almost the speed of light. And when black holes spin, they profoundly disturb the surrounding space-time in ways that astronomers can detect and measure.
Other feature articles in the May issue discuss a critical period of transition in the early universe, how an amateur astronomer built his ultimate dream observatory, what you can see in the great Virgo-Coma cluster of galaxies, and how to rid your astrophotos of annoying ghost images.
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