Mars remains a true puzzle, but not for the reasons most people would think. Sure, there's debate over whether it ever had surface water, oceans and life. But Mars’ small mass relative to earth and Venus have been a major conundrum that has plagued planetary scientists for decades.

https://www.forbes.com/sites/brucedorminey/2024/12/30/mars-small-mass-still-puzzles-planetary-scientists/

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