  Using the FLUIDICS (Fluid Dynamics in Space) experiment in the International
Space Station, turbulence of capillary waves at the air-water interface is
experimentally investigated in weightlessness. Capillary waves are excited in a
spherical container partially filled with water and undergoing sinusoidal or
random oscillations. The fluctuations of the interface, recorded with two
capacitive probes are analyzed by means of the frequency power spectrum of wave
elevation. For high enough forcing amplitudes, we report power-law spectra with
exponents close to the prediction of weak wave turbulence theory. However, in
this experiment the free-surface steepness is not small compared to 1 and thus
the investigated regimes correspond to strongly nonlinear wave turbulence.
