I typed much of this several months ago also some of the material on colonization which has been moved to colonization of Mercury Keep on editing my posts as I still have a lot to learn I m unable to edit 5 to 15 of this talk page so a paste follows But also corrected the straight forward surface gravity from 2 78 m s to 0 926 m s Fits with the compared to Earth number of 0 0945 at least But meanwhile using the numbers in there for the mass and diameter I get a surface gravity of 3 70 m s Looking back through the history it s been 2 78 m s since the page first got a surface gravity What gives 2 78 meters per second per second m s2 is likely low but 3 70 is likely a bit high 0 96 m s2 is way low as is 0 0945 for Earth 0 96 g might be correct for Earth s gravity in low Earth orbit but it is likely a bit less or it might be Earth s surface g at Earth s equator but likely that is a bit more Neil