Europa is smaller than Earth's Moon, yet the ocean locked beneath its ice contains more liquid water than every ocean on Earth combined — kept from freezing not by sunlight, but by Jupiter's gravity squeezing the moon like a slow, endless fist Space Daily Europa may hold more water than Earth, but a new study suggests its hidden ocean is almost impossible to reach The Times of India Limited direct fluid exchange between the deep subsurface ocean and the shallow subsurface environment of Europa N