Scientists recently found even more evidence that Jupiter's icy moon Europa is hiding an enormous ocean of saltwater.

To say Europa's ocean is vast would be an understatement. If all of Earth's water — oceans, lakes, rivers, rain, clouds, and more — were combined into one blob, it'd be just half as large as Europa's liquid reservoir. (And Europa is about the size of Earth's moon.)

Scientists think Europa's ocean might even be habitable to alien life.

"If there's life at Europa, it'd almost certainly be an independently evolved form of life," Bob Pappalardo, a planetary scientist at NASA's Jet Propulsion Laboratory, previously told Business Insider. "Would it use DNA or RNA? Would it use the same chemistry to store and use energy? Discovering extraterrestrial life would revolutionize our understanding of biology."

But Europa is just one of many ocean worlds in the solar system, including Enceladus, Pluto, Titan, and Ganymede.

To figure out how much liquid water and ice these worlds have compared to Earth, Business Insider contacted Steve Vance, a planetary scientist at NASA's Jet Propulsion Laboratory. Vance closely monitors research about ocean worlds to create estimates of ice thickness, ocean depth, and other parameters.

The graphics below use Vance's data and other sources to show the probable volume of liquid water on eight known ocean worlds besides Earth.

Volumes are shown in zettaliters (ZL), a unit that's equal to 1,000,000,000,000,000,000,000 liters or 1 billion cubic kilometers. Earth harbors about 1.335 ZL of water, according to the National Oceanic and Atmospheric Administration.