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So mark your calendar for the 16th June 2015 This is an awesome event itself but on this night you will have an amazing chance to view our celestial neighbors Europa: Planetary scientists generally think that a layer of liquid water swirls around beneath Europa's surface, and that heat from tidal flexing causes the subsurface ocean to remain liquid. It is estimated that the outer crust of solid ice is about 6 to 19 miles thick, including a ductile "warm ice" layer that hints that the liquid ocean underneath may be 60 miles deep. This means that Europa's oceans would amount to slightly more than two times the volume of Earth's oceans. Discovering the little moon also reinforces the theory that most dwarf planets have moons.