  Acoustic oscillations in stars can be driven by gravitational waves. However,
at present it is not feasible to use the helioseismology data for their
detection, since it is impossible to disentangle the uncertain driving
contributions originating in the Sun itself.
  We here point out that any such wave will affect also Jupiter and Saturn in a
similar $and$ $coordinated$ $way$; after all, they are mostly spheres of gas
like the Sun, only one order of magnitude smaller. Hence, akin to the concept
of coincidence detection in particle physics experiments, evaluation of the
time-correlation function of the measured acoustic velocities of the same mode
of oscillation of any two of these three objects will eliminate the
(independent) internal effects; and observation of a peak in that correlation
function will be tantamount to detection of a gravitational wave. There is a
(slight) possibility that such detection has already occured.
