It’s called shrinkage, and it can happen to any planet

Don't tidal forces also play a role in keeping Ganymede's core liquid? Or is that Io's volcanic activity?

Jupiter emits a lot of radiation, so the surface of this moon is still not completely safe despite the magnetic field:

> The radiation level at the surface of Ganymede is considerably lower than at Europa, being 50–80 mSv (5–8 rem) per day, an amount that would cause severe illness or death in human beings exposed for two months.

Though considering how cold it is, a human would be wearing a suit anyways.

I was trying to illustrate the formatting and to show it wouldn’t be all that hard to read if we did it that was in English, either. And you can keep moving the goalposts all you want; your comment was unnecessarily pedantic and didn’t really make a rebuttal of any point you thought I was trying to make.

でも、この話を続けたいのだったら、是非日本語でお願いします。そんなに日本語が詳しい方なら、きっと大丈夫でしょう。では。

That must have been where my mind was at - thanks for the clarification!

Significant Oxygen only is, because oxygen is so reactive that it bonds with other elements pretty fast. Trace amounts are ok, but if you see a planet with 10-20% oxygen (and the atmosphere isn't super thin), it's almost certainly going to be life.

A big reason for Mercury’s core being so big compared to its total volume is that the outer layers of the planet have been blasted by incredibly intense heat and radiation over billions of years.

Think how long the top soil of Earth would survive temperatures that swing between 420°C to -170°C from day to night, with unimaginable radiation at all times.

Oxygen is the third most abundant material in the universe. It’s made at the end of the helium fusion process in massive stars, and our sun is 0.9% oxygen by mass.

There’s oxygen on Mars and Venus too, but in insufficient quantities to support the oxygen cycle. The fact that we have the oxygen cycle (part of that being photosynthesis) is why Earth has a much higher amount of oxygen, but it’s not the only source of it.

You made it sound like Japanese was as difficult to read as running all your words together. And on the odd occasion you actually find all hiragana, children's books, for example, you'll find spaces to help separate words.

I find it fascinating that someone with near 20 years experience thinks they can misrepresent the facts and be surprised when people "chime in".

i'm pretty sure the orbit is going to clear boundary. but i know what you mean, i'm still salty about Pluto, too.

gotta love our incredible core. Solid metal ball surrounded by flow of liquid metals, creating dynamo. forcefield a la Starcraft Immortals. Any stronger and vulcanic activity would make catastrophic events too frequent, preventing intelligent life to evolve.

any weaker and the solar radiation would be too strong on the surface, wrecking organics.

That is not true

Meaning of camel case in English. the use of a capital letter to begin the second word in a compound name or phrase, when it is not separated from the first word by a space: Examples of camel case include "iPod" and "GaGa".

We are 2 planets in 1

You're thinking of Mimas.

Fair, but that comparison loses traction for katakana and hiragana compounds, so I don’t think I missed the mark by that much. I’d have to combine Roman numerals and some kind of ideographic font like a complex mixed Wingdings to truly represent the difference, but I considered my approach sufficient to get the point across.

I do find it fascinating how many people like to chime in about how much more they understand about the Japanese language than a person who has lived in the country for the better part of two decades, though.

It's not exactly like that. Kanji makes it more like if you used camel case in English. MoreLikeIfYouWroteLikeThis. But even that's not the same since kanji are far more distinct than upper case letters.

Not definitive proof but this has a good explanation why they think it has an underground ocean.

https://www.nasa.gov/press/2015/march/nasa-s-hubble-observations-suggest-underground-ocean-on-jupiters-largest-moon/

Trust me big bro

I thought oxygen was only present as a byproduct of organic materials ?

Kind of proud our largest moon is named for gay icon Ganymede!

How do you expect anyone to proof this when NASA and the like are still at the stage where they think it likely has more water than the earth's surface. There are strong indications for it, but a random redditor doesn't have a space telescope lying around to verify the Hubble's findings, do they?

A word can be comprised of either one symbol, or many symbols!

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No matter, always toughest for a belta, sasa ke?