why is every major planet in solar system is almost spherical why is not of any other shape?

Answer 1

It's because of gravity, which pulls all the pieces of the planet in toward the common centre of gravity. The resulting shape is a spheroid. Also, as this happens the whole mass begins to rotate. The tighter the ball the pieces are squeezed into, the faster the rotation. This is why all planets rotate on an axis through their centres of gravity. The resulting centrifugal "force" causes the planets to flatten out a bit, so they are not perfect spheres, but oblate spheroids.

Smaller objects, such as asteroids or even small moons, may not have enough mass for gravity to play a large role in their development, so these small bodies might have stranger shapes.

Answer 2

Gravitation is an example of a "central force" meaning the force always acts as if it were concentrated at a point at the center of the body. (The electrostatic force is also a "central force"). The force equation for a "central force" is always proportional to the inverse of the square of the distance from the center of the body, so everything gets pulled to the center.

So all of the people who posted that the larger bodies in space are nearly spherical because of gravity acting to attract all of the mass towards to the center are absolutely correct (whoever is given them a "thumbs down" doesn't know what he or she is talking about). And it has nothing to do with whether or not the core of the planet if molten. If the planet has enough mass it will tend to be spherical. Of course, a smaller body will more likely to become spherical if is has a molten core (more deformable).

Rotating bodies will deviate form exactly spherical because the centrifugal force does cause them to bulge at the center (as others have posted).

Update:
Raghavan's explanation is sooooo... incorrect I don't even know where to begin to refute it. It's not worth the effort

Answer 3

Anything that is violently thrown out / away not only moves in the diection of the force that pushed it , but spins as it moves in any direction.This spin should be around an axis and when the spin is around an axis , the matter around the axis gets distributed equally arond it to establish an uniform spin and so the mater around the axis gets spread around almost unioformly due to the gravity which pulls all the matter towards the center. This pull being uniform around the surface of the object that spins , naturally tend to form a globular shape,this shape alone establishes ensures that the surface of the object at every point on it is at an equal distance to allow he body to spin with a unofrm speed .For a globular object alone every point on the surface is a center and any line drawn vertically to the surface goes through the center of the globe and so evry point on the surface is alsoa center of he object .In no other shape - say a square , a cube , a cylinder , a cone , evry point on the surface can not / is not a center .since all mases has he character of gravity ,and the gravity tends to pull higs towards the center of the mass , the matter around the surface / body of any spinning object tends to fall towrds the center of the glob / or pulled towards the center and this results in the body being shaped as a glob .

Answer 4

Turbulence,centripetal force and constant rotation makes a planet body spherical despite being made by irregular bodies i.e. planetesimals.
Since every major planets obeys this rule all of them are spherical.

Answer 5

Planets are round because their gravitational field acts as though it originates from the center of the body and pulls everything toward it. With its large body and internal heating from radioactive elements, a planet behaves like a fluid, and over long periods of time succumbs to the gravitational pull from its center of gravity. The only way to get all the mass as close to planet's center of gravity as possible is to form a sphere. The technical name for this process is "isostatic adjustment."

With much smaller bodies, such as the 20-kilometer asteroids we have seen in recent spacecraft images, the gravitational pull is too weak to overcome the asteroid's mechanical strength. As a result, these bodies do not form spheres. Rather they maintain irregular, fragmentary shapes.

Answer 6

Everything in the universe is rotating and revolving around something. Gravity forces all rotating bodies to be spherical. Also it is the only shape that can hold maximum volume with minimum surface area.

Answer 7

Planets shapes, as well as that of our sun, is due to the heat energy contained within them. If there were no heat energy the mass could assume any shape and retain that shape.

The heat energy within a mass is what causes its gravitational field - c2 = E/m, so were we to find a large planet that had a greatly distorted shape an immediate assumption would be that the mass had a very low field of gravity. If it had no heat energy within, it would have no gravitational field.

Answer 8

Gravity is pulling each and each and each thing on the comparable time. mutually as the planets have been thoroughly liquid the exterior froze (into rock) keeping the planets suited right into a style of around shell acceptable-wide-spread simply by certainty the crust. interior the gas planets and the celebs they're regularly gas so the gas is often attempting to settle (simply by certainty it extremely is being pulled in by using an excellent quantity of gravity) giving them a on the edge of around shape. in case you prefer to be conscious of why it extremely is a sphere the respond is easy. In a sphere distance between the centre (or centre of gravity subsequently) and the exterior is equivalent in all policies. additionally be conscious that none is easily around. Rock planets have craters and mountains and diverse formations. In gas planets and stars the gas is often shifting and there is regularly a bulge around the equator simply by certainty the gas is being pushed outwards by using their spinning action.

Answer 9

you see,when the solar system was formed,the sun emerged as the main star.the reamining debris formed into 8 irregularly shaped planets.they looked like potatoes.when the sun started pulling them they acquired their orbits and started rotating due to the continuous gravity of the sun.this rotation led them to their spherical shape they possess now.

Answer 10

all objects are attracted to each other in proportion to their mass (ask newton). so if you have two atoms, they will try to get close and orbit around some point. if you have three, they will all try to get close to each other around some point. if you have a billion atoms, they will all try to get close to each other around some point, and so on.

the easiest way for all the atoms to be close to each other without being out of balance (gravitationally speaking) is to form a sphere, where the furthest distance is equidistant all the way around, and hence the force vectors are also equidistant.

think of the moon being a cube. the gravitational pull on the corners of the cube from the center point would be greater than on faces, which are less distant from the center point. the corners would mash in toward the center, so gravity would even out.

now think of mountains versus oceans. the earth in not perfectly round, but it wants to be (also see newton for this).