What planetary body (Planet or Moon) in the solar system is believed to have the most water?

NASA scientists announced in 2015 the discovery of a large saline ocean on Ganymede, the largest of Jupiter's moons. Using the Hubble Space telescope, they have determined that the saltwater ocean on Ganymede is up to 60 miles deep - around 10 times the depth of Earth's ocean, and containing up to 39 times the quantity of water on Earth, according to Nasa Scientist Joachim Saur. "The Solar System is looking like a real soggy place" announced NASA director of Planetary Science, Jim Green.

Ganymede is the largest of Jupiter's moons, and is larger than the planet Mercury, nearing the size of Mars.

In order of having the most water, here are the top seven planetary objects scientists believe to contain water: Ganymede, Titan, Callisto, Triton, Pluto, Europa, Earth.

More Info: www.businessinsider.com

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23 Comments

Andy Wright

Great question. I knew that all water on the earth originally came from comets, and that presumably all other water in the solar system had the same origin, and that Europa and Ganymede are moons of Jupiter, which would attract comets more than the earth since Jupiter is so large. I also knew that Ganymede was larger than Europa so (Vulcan is purely fictional) it has to be Ganymede. Good to have a question that you can work out logically rather than rely on rote learning

Steve McVey

jay sheppard nl, There is actually a lot of scientific evidence which is very interesting but would clearly be way above your 'if I can't see it, it doesn't exist' mind.

Maryann Amaro

Very very interesting honestly did not know other planets had water something I didn't have interest in when I was in school NOW I KNOW

Coral Harvey

Thank you majority vote ! Earth indeed ! I guessed Gany mede as was right all along !

Jaimi McEntire

Tom Seigo, Besides the NASA scientists quoted in the article, you mean.

Jaimi McEntire

Trevor Macey, Yes. Yes they did. We have sent several probes to Jupiter.

Claire Mitchell

News to me! Thanks for the info.

Rob Farr

A good guess got it for me ... I thought that Earth would be too obvious ... and I was right.

Jon Woolery

I knew it was a Jovian Moon. Guessed wrong.

Val Wilkinson

I thought Ganymede was where The Doctor came from?

Trevor Macey

Andy Wright, so how do you KNOW water on earth came from comets? Have you ever inspected a comet, have you any evidence that a comet brought water to the earth and f it did how did so much water self propogate? mere wishful thinking because water cant v=create itself on a cooling lump of rock called earth.