Why are all planets Round? Why Round and not other shape?

Answer 1

because gravity acts equally in all directions

Answer 2

Planets and stars are round because of gravity. Gravity pulls equally in all directions. Suppose you had a great big, tall mountain. As time goes by, rocks and dirt loosen up and fall down the mountain side. Eventually the mountain is worn down. Similarly a deep, deep valley will fill up. Of course a planet is not perfectly round — look at the mountains and valleys on the Earth and on Mars! Also the bigger the planet, the stronger the gravity. So bigger planets will be rounder. Tiny planets may not be very round. For instance, some of the moons around Jupiter are not very big and are not round — sort of oblong and irregular. Asteroids, which may be only a few miles long, are also irregular.

Answer 3

All planets are not round. In fact, most planets (that we can observe easily), are oblate spheroids. This is due to their rotation. Gravity balances centripetal accelerations creating a 'bulge' at the equator. For example, the earths radius at the equator is ~ 22 km more than at the pole. The motion of the substance (and substance properties) and the gravitational self attraction are what determines the shape of a planet. Why there are no squares? Because at planetary scales, most materials will behave in a liquid fashion, even metals and rocks.

Answer 4

The planet's rotation on its axis and the play of gravity on its surface must be met with an equilibrium or the planet would self destruct. The perfect shape of the planet to induce equilibrium is the sphere. As to why there are no planets with another shape, the aforementioned forces would cause the also aforementioned self destruction.

Answer 5

that is true that all the planets R round but there is only one that spins differently.
That is URANUS.

IF U WERE 2 BREAK THAT WORD N2 3 PARTS IT WOULD B (U RAN US). Or u can make a sentence out of this.
U ran us down the street 4 nothing with no time 2 spare, whats wrong with u?

Answer 6

Who says all the planets are round? Maybe there are some square planets out there that we just don't know about yet. And maybe people with square heads live on those square planets and walk in only straight lines.

Answer 7

They matter that makes up the planet is acted upon by gravity, and because that force is equal coming from all directions, it causes a ball.

Answer 8

gravity makes them since it pulls and pushes in all directions equally. they really aren't round though, all the planets are slightly irregular in some way and definitely have pockmarcks.

Answer 9

because a sphere has no sides. in any other shape besides a circle/sphere there are sides that are angular and gravitaitonal force in the sky does not permit anything popping out in a 3D shape so a sphere formed, because all the angular sides and vertices are gone because gravity acts in every single direciton, and there goes...

Answer 10

Gravity.

Answer 11

earth is actually a geoid. round but a bit wider at the equate due to centrifugal force.