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Building a decent sized moon for Mars, or simply increasing the Mars' mass and thus its gravity?
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A small moon can hold a tremendous amount of angular momentum which is directly useful in stabalizing the degree that the planet tilts over many thousands of years. It will stretch the crust and add heat to Mars thru tides. It can be put into a decaying orbit (via rotation periods and mass concentrations) so after many million years it will hit Mars adding heat an mass to the planet and (perhaps) starting volcanoes and a MASSOUTFLO event.
All of these advantages can be had for many orders of magnitude less than trying to build up Mars' mass by a significant amount.
Nice question.
Warm regards, Rick
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