FastSaying
No one predicted Mercury would be a planetary core with the mantle stripped off. No one predicted volcanoes on the Jovian moons, or oceans on the inside of them. I can tell you, for every single planet, huge 'we never guessed that' things.
Alan Stern
Core
Every
Huge
I Can
Inside
Mantle
Mercury
Never
Oceans
Off
Planet
Planetary
Predicted
Single
Stripped
Tell
Them
Things
Would
You
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