Data from the Galileo space probe suggests there’s an ocean on Jupiter’s moon Europa, which is Earth-like and could harbor life. The moon’s icy crust is relatively thin, with cracks and vents, which would allow gases, heat and organic matter to reach water underneath. This is same situation that probably exists on Mars.
Europa?s ocean may be like the icy bodies of water on Earth, such as the Arctic Ocean, which is our smallest ocean and occupies the area around the North Pole. It?s exposed to air and heat through its cracking and melting ice.