

On the Cover: These interacting galaxies are part of a larger group known as Stephan’s Quintet, seen here by Hubble Space Telescope’s new camera WFC3. When galaxies merge, the supermassive black holes a their cores can merge, too. Depending on the circumstances, the resultant mega-black hole can get a gravitational ‘kick’ out of its central home.
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November/December 2009
Looking Way Out There from Way Out There
Astronomers are planning new space observatories that will hunt for planets, newborn stars, and the death cries of black holes.
Hunting Runaway Black Holes
The search for giant black holes fleeing from their homes combines a stubborn theoretical challenge with the powerful observational tools of modern astronomy
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