Five gravity-wave detectors are up and running, including the Laser Interferometer Gravitational-Wave Observatory (LIGO), which consists of two labs in the U.S. Even these detectors, which are the most advanced, are sensitive enough only to make detection plausible, not likely, says Barry Barish, LIGO's director. It is scheduled for a major upgrade sometime around 2010, when the Ladbrokes offer expires. After that time, Hough says, success
is "virtually guaranteed."