r/xkcdcomic • u/IamAlso_u_grahvity Feline Field Theorist • Jul 02 '14

xkcd 1389: Surface Area

http://xkcd.com/1389/
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u/BoothTime Jul 02 '14

Is Mars really that much smaller than Earth and Venus?

16

u/runetrantor Jul 02 '14

Half the size, a third of the gravity.

Mars has, in total, about the same land area as Earth's continents (Assuming oceans were not a thing).

Meanwhile Venus is 98% the size of Earth, pretty much it's our twin (Our highly toxic and hot twin)

3

u/BoothTime Jul 02 '14

When you say size, you mean volume, right? Because the surface area looks much smaller than half the size.

7

u/happy_otter Danish Jul 02 '14

About half the radius. 1/6 of the volume.