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All the land in our solar system (imgs.xkcd.com)
submitted 1 year ago by to c/map_enthusiasts@sopuli.xyz
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Source: https://brilliantmaps.com/solar-system-surface/

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[–] 24 points 1 year ago* (last edited 1 year ago) (4 children)

I can't readily recall the Earth's actual sq. km surface area, and can't remember ever having heard the figure for Mars. Time to drop into Wikipedia and take a gander, I think.

EDIT: I'll be damned, TIL that the Earth has an area of 510.06 10^6 km², but Mars' is only 144.37 10^6 km², only about 1⁄3 the size (28.3%).

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  • [–] 10 points 1 year ago* (last edited 1 year ago) (2 children)

    The circumference is roughly 40,000 kilometers. The original definition for a meter was such that 10,000 kilometers was the distance from the equator to the poles (so a quarter of the circumference). They got the math slightly wrong and didn't want to people to think the process was wrong so they didn't correct it. I forget the actual circumference but that is close enough for very rough estimates.

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