isostasy
Yes, Pluto has been determined to be in hydrostatic equilibrium. Planets must orbit the sun (the first criterion for a planet), and must also be in hydrostatic equilibrium (which Pluto is). Pluto fails the third "planetary entrance test" set by the IAU in that it has not cleared its orbit of debris. A link can be found below to check facts and learn more.
Hydrostatic equilibrium basically means the object has a round shape - spherical if it doesn't spin quickly, in the form of an ellipsoid if it does.Self-gravitation is the mechanism that causes it. It means that all of the parts of the object attract one another.
I think it is. Take a look at some pictures of Mimas; it looks pretty round to me.
it ruins the equilibrium
Hydrostatic and Equilibrium
isostasy
Yes, Pluto has been determined to be in hydrostatic equilibrium. Planets must orbit the sun (the first criterion for a planet), and must also be in hydrostatic equilibrium (which Pluto is). Pluto fails the third "planetary entrance test" set by the IAU in that it has not cleared its orbit of debris. A link can be found below to check facts and learn more.
Basically it is because of gravity. The technical explanation is called the " principle of hydrostatic equilibrium ".
hydrostatic equilibrium
Hydrostatic equilibrium basically means the object has a round shape - spherical if it doesn't spin quickly, in the form of an ellipsoid if it does.Self-gravitation is the mechanism that causes it. It means that all of the parts of the object attract one another.
I think it is. Take a look at some pictures of Mimas; it looks pretty round to me.
The properties of a main-sequence star can be understood by considering the various physical processes occurring in the interior. First is the hydrostatic balance, also called hydrostatic equilibrium. This determines the density structure of the star as the internal pressure gradient balances against the force of gravity.
hydraulics uses the principle of hydrostatic pressure to work
Hydrostatic equilibrium [See related question]
Pretty much so. It isn't PERFECTLY spherical, but it has achieved "hydrostatic equilibrium", meaning that its internal gravity has crushed it into a ball.
That would be an object that:* Orbits the Sun * Is in hydrostatic equilibrium (basically this means it has a round shape) * Has NOT cleared its surroundings