Europa’s Global Ocean

Many people don’t realize that Jupiter’s moon Europa is actually covered in a global-wide ocean of liquid water. It’s an exciting prospect for humans who wish to answer the profoundly significant question “has life ever originated in other parts of the universe?”

Follow the Water
NASA’s mantra for finding life on other worlds has been “follow the water.” That’s because life as we know it depends on water to survive. Finding water on the surface of other planets and moons in our solar system has been nearly impossible because most of the time, the low atmospheric pressures on other worlds combined with extremely low temperatures prohibit it.

For H2O to exist in liquid form, there has to be enough atmospheric pressure to hold it together, and Earth is the only place we know of where that happens on the surface. On Mars or Europa for example, there just isn’t enough atmospheric pressure to hold water molecules together, so even if the temperatures get high enough for it not to freeze, it basically boils away the minute it reaches the surface.

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