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NASA launches Mars rover to look for signs of ancient life

Rostocker said:
In March 2015, scientists reported that measurements with the Hubble Space Telescope of how the aurorae moved confirmed that Ganymede has a subsurface ocean.[44] A large salt-water ocean affects Ganymede's magnetic field, and consequently, its aurora.[18][72][73][74] The evidence suggests that Ganymede's oceans might be the largest in the entire Solar System.[75]
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Let me guess, Wikipedia is your source? Why else would you be embarrassed to post your source?

Cite a peer-reviewed paper, then we'll talk.
 
Rostocker said:
Hubble Sees Potential Underground Ocean on Jupiter's Largest Moon | NASA


Underground ocean on Jupiter's largest moon, Ganymede -- ScienceDaily
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Neither of your links are peer-reviewed sources. The NASA press release was less than useless, but at least the Science Daily article presented a clue where the paper could be found. The very last sentence in the article stated: "The team's results will be published online in the Journal of Geophysical Research: Space Physics on March 12."

So I looked it up. This is what you should have posted:

The search for a subsurface ocean in Ganymede with Hubble Space Telescope observations of its auroral ovals - Journal of Geophysical Research: Space Physics, February 2015

The paper makes a very good case for a liquid ocean under Ganymede's surface. Do you have something similar for Castillo?

I do try to stay current with the latest discoveries in astrophysics and astronomy, but I admit that the Journal of Geophysical Research: Space Physics was not on my reading list.
 
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