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Spherical shape of planets
As matter accretes, its gravitational attraction increases. Continous accertion leads to an inward gravitational force that can overwhelm the forces that give solid- state structures their integrity. Under a gravitational force that is large enough, even rocks melt and flow. Each particle on the surface of the aggregate wants to get as close to the centre as possible and the shape of the aggregate tends to become spherical - that is what natural equity or democracy would demand.
Extremly high mountains- protrusions beyond the spherical surface- are not viable because their weight would make them sink down. When we get to aggregations of planetary levels, the height of the highest mountain is inversely proportional to the mass of the planet. Mars has higher mountains and deeper valleys then does the earth because it is less massive then the Earth, even our tiny satellite, the moon , surpases the earth in this regards, whose highest mountain peak sticks out to a height of barely 9km on a sphere whose diameter is nearly 13,000km.
The spherical shape of heavinly bodies testifies that gravitational force of matter in bulk can overcome all other sustaining forces.
Extremly high mountains- protrusions beyond the spherical surface- are not viable because their weight would make them sink down. When we get to aggregations of planetary levels, the height of the highest mountain is inversely proportional to the mass of the planet. Mars has higher mountains and deeper valleys then does the earth because it is less massive then the Earth, even our tiny satellite, the moon , surpases the earth in this regards, whose highest mountain peak sticks out to a height of barely 9km on a sphere whose diameter is nearly 13,000km.
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