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* There's nothing on or in Mars which isn't known.
* Orbital mechanics, defines Mars' mass.
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Ah, but what about what's inside Phobos? Orbital mechanics say it's hollow and radar from flybys suggest two or three major voids.
I find Phobos with it's obelisk and rectangular ports more interesting than Mars itself
Deimos is a gateway to the outer Solar system.
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And water erosion can't produce the lateral branches. It concentrates to the center instead of radiating outward.