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#::The objection has been raised that the experiments should not have been funded if scientists were going to ignore negative results.

#::The objection has been raised that the experiments should not have been funded if scientists were going to ignore negative results.

#:::The results are only partly negative.  The scientists knew all along that a certain amount of luck would be involved in finding a sufficiently strong signal within the time frame of the experiment.  The failure so far does not mean that black-hole mergers do not emit gravitational waves; just that they haven't been lucky enough to find them.  They will continue to search.

#:::The results are only partly negative.  The scientists knew all along that a certain amount of luck would be involved in finding a sufficiently strong signal within the time frame of the experiment.  The failure so far does not mean that black-hole mergers do not emit gravitational waves; just that they haven't been lucky enough to find them.  They will continue to search.

#:'''Update:'''  Another, much more commonplace observation of gravitational wave emission has been reported.<ref>http://www.bbc.co.uk/news/science-environment-19408363 BBC article</ref>  The article suggests that, since it shows detectable gravitational waves are more common than previously thought, there is optimism that the eLISA detector, when completed, might find one source per week.

#:'''Update:'''  Another, much more commonplace observation of gravitational wave emission has been reported.<ref>https://www.bbc.co.uk/news/science-environment-19408363 BBC article</ref>  The article suggests that, since it shows detectable gravitational waves are more common than previously thought, there is optimism that the eLISA detector, when completed, might find one source per week.

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#:'''Update 2:'''  Gravitational waves have been detected directly through LIGO: the Laser Interferometer Gravitational-Wave Observatory.

#:'''Update 2:'''  Gravitational waves have been detected directly through LIGO: the Laser Interferometer Gravitational-Wave Observatory.