why the moon is round?

Answer 1

The same reason all large heavenly bodies are roughly round -- their large mass produces large internal gravitational forces.

The rock is malleable under such extreme forces and distorts accordingly. The body's shape reaches equilibrium when the shape becomes symmetric. e.g. If the shape started out very uneven with "corners" (imagine a cube as an extreme) then gravitational forces on the mass in the corners would be greater than on the sides, and the corners would slowly get "pulled in" and re-distribute around the surface until the forces balance out and all points on the surface are subject to equal gravitational force.

Smaller bodies than the moon (e.g. asteroids) may not have enough mass to generate forces that are sufficient to distort the shape of the rock and so they stay misshapen.

Note that spinning bodies are actually less round because they tend to bulge along their equator, and rotation is not the source of the bodies' original roundness!

Answer 2

the rotation of the moon and the gravity causes the moons round shape. Imagine roling clay in a ball, thus applying equal pressure to each part of the ball. No other shape has an equal radius, because there is equal pressure. Just like every other planet.

Answer 3

Before it formed into its present state, what would become the moon consisted of individual bits and pieces of material drifting in space. Each of these particles were gravitationally attracted to each other. At the moment two particles came together because of this attraction, all other individual particles were pulled towards them since the joined pair now had more gravity. Over time particles fell into this central point from all directions, thus increasing the center of gravity. Since the additional particles came from all directions around the core, the end result was a sphere.

Answer 4

Because if it were square it would be a... err... that joke doesn't work does it?

In fact, the moon is not round, it is elliptical (well, actually it's an ellipsoid because it's 3D, not 2D) but I'm sure you knew that.

What was the question again?

Answer 5

Any sufficiently large celestial object will assume a spherical shape due to its own gravity. Any significant deviation will cause internal stresses resulting in material flow. Any mountain too high will collapse from its own weight, for example.

Answer 6

The moon is round because earth is flat, jupiter is retanglular and pluto is square, you see there has to be a little of everything in this galaxy...

Answer 7

All the other shapes were taken.

Answer 8

because God made it that way.
What shape should it me?
Rectanglular? Triangular? Oval? Trapezoid?