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Business Insider

By Dave Mosher and Jenny Cheng
Earth seems drenched with water from mountaintop to ocean bottom.
But our home planet is a desert compared to some places the solar system, both in terms of its total water volume and the amount of liquid on Earth relative to its size.
Consider Jupiter’s ice-encrusted moon Europa, which is smaller than Earth’s moon. Scientists recently used 20-year-old Voyager data to find even more evidence that Europa has twice as much water as our planet. Even tiny Pluto may have an ocean nearly as large as Earth’s.
Nasa abandons robotic rover that would have explored polar region of the moon, causing ‘dismay’ among scientists
Steve Vance, a planetary scientist at NASA’s Jet Propulsion Laboratory, has kept a close eye on research about ocean worlds over the years. He has rounded up estimates of ice thickness and ocean depth throughout the solar system to calculate roughly how much water may exist.
The graphic below uses Vance’s data and other sources to show the probable volume of liquid water on nine known ocean worlds, including Earth:

Amounts of water are shown in zettalitres (ZL), a unit that’s equal to 1,000,000,000,000,000,000,000 liters or 1 billion cubic kilometres. Earth harbours about 1.335 ZL of water, according to the National Oceanic and Atmospheric Administration.
In order of how much liquid water each world is estimated to have (from least to most), the ranking is: Enceladus, Triton, Dione, Pluto, Earth, Europa, Callisto, Titan, and Ganymede.
Ganymede, the largest moon of Jupiter, is the wettest world in the solar system for another big reason: A staggering 69 per cent of its total volume may be liquid water, which is more than any other on the list.
Mimas, a moon of Saturn, and Ceres, the largest asteroid in the solar system, might also have oceans. But scientists aren’t yet sure how big each one might be, if they exist at all. More space missions are required to find out.
NASA is currently planning a mission to Europa to map the icy moon in unprecedented detail. The Europa Clipper is expected to launch between 2022 and 2025. The probe will hopefully give us a better estimate of the size of Europa’s ocean, and repeatedly “taste and sniff” water plumes spraying from its surface.
The European Space Agency is planning a similar mission called the Jupiter Icy Moons Explorer, which may launch in 2022 and reach Jupiter in 2030. That mission calls for two flybys of Europa and an eight-month orbit of Ganymede.
One of these robots could discover the first signs of alien life hundreds of millions of miles from Earth.
See Also:
New evidence that a giant ghost planet may lurk in our solar system
NASA accidentally flew through a blast of alien ocean water in 1997
To survive on Mars, we need a ‘technology that replaces what the Earth does
Read the original article at Business Insider


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Space

Icy moons in the solar system hide so much liquid water, they make Earth look like a desert planet

Earth from space looks blue thanks to all of its water. Photo: NASA

Earth dwarfs other ocean worlds in the solar system, but several Europa, Pluto, and others have bigger oceans of liquid water. Photo: Jenny Cheng/Business Insider

Scientists just discovered that NASA flew through a blast of alien ocean water in 1997 — and a US$2 billion mission may soon ‘taste’ it for signs of life

Jupiter's moon Europa, as seen by NASA's Galileo spacecraft in the late 1990s. Photo: NASA/JPL-Caltech/SETI Institute

An illustration of the Galileo spacecraft flying by Jupiter's moon Io. Photo:NASA/Flickr (public domain)

An illustration of NASA's Europa Clipper mission flying over the icy moon of Jupiter. Photo: NASA/JPL-Caltech

A plume of subsurface ocean water vapor escapes through a crack in the icy crust of Europa, a moon of Jupiter. Photo: NASA/ESA/K. Retherford/SWRI

Tech

Science & Research

Ganymede, the largest moon of Jupiter, may have the largest ocean in the solar system


United States

Icy moons in the solar system hide so much liquid water, they make Earth look like a desert planet

.css-1c6uqr6{color:inherit;font-weight:inherit;font-size:inherit;font-family:inherit;line-height:inherit;overflow-wrap:break-word;}Ganymede, the largest moon of Jupiter, may have the largest ocean in the solar system

Ganymede, the largest moon of Jupiter, may have the largest ocean in the solar system