  The Earth is no longer the only known celestial body containing one or more
liquid phases. The Cassini spacecraft has discovered seas of hydrocarbons at
the surface of Titan, while a series of corroborating evidences argue in favour
of the existence of an aqueous ocean beneath the icy crust of several moons.
Capillarity embraces a family of physical processes occurring at the free
surface of a liquid. These phenomena depend on the liquid properties and on the
local planetary conditions. Capillarity may have important direct or indirect
implications on the geoscientific and astrobiological points of view. In this
paper, we discuss capillarity physics among solar system objects and expected
consequences for planetary science.
