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Europa's ocean is estimated at 40 to 100 miles deep, so even though it is one-quarter the width of Earth, it may hold twice as much water as all of Earth's oceans combined.
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Nasa's Europa Clipper mission, due to launch in 2024, is expected to shed light on how the double ridges formed when it performs detailed reconnaissance of Jupiter's moon and investigates whether it harbours conditions suitable for life.
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