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buy diltiazem hcl The orbital timing of the plumes, probably not coincidentally, is the same as that for Enceladus, Roth says. That moon???s sprays of ice are most profuse when Enceladus is farthest from Saturn in its orbit. Most likely, scientists have proposed, the tidal flexing induced in a moon???s icy surface causes cracks in polar regions to open widest while the satellite is farthest from its parent planet but clamp shut at other times. It???s not clear whether Europa???s plumes, like those on Enceladus, are triggered by icy surfaces of a surface fracture rubbing together???somewhat akin to the sides of a tectonic fault scraping past one another???or whether they represent water vapor spewing from Europa???s subsurface ocean through narrow cracks in the moon???s polar ice at supersonic speeds, Roth says.