| http://www.w3.org/ns/prov#value | - There are, of course, still uneven features on the surface of planets, such as mountains and valleys, but they become smaller as gravity increases. (See also the Astronomical Question from week 4: ???What is the highest mountain in our solar system????) Irrespective of the material composition of the celestial body, a diameter of a few hundred kilometres is sufficient to create a spherical form ??
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