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 to of this talk page so a paste follows but also corrected the straight forward surface gravity from m s to m s fits with the compared to earth number of at least but meanwhile using the numbers in there for the mass and diameter i get a surface gravity of m s looking back through the history it's been m s since the page first got a surface gravity what gives meters per second per second m s is likely low but is likely a bit high m s is way low as is for earth 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