Why is everything in space like the earth and the moon round starts etc serious?

Answer 1

It's the "lowest energy" for things (atoms, dust, etc) to come together.

In a cube or other shape w/ corners, the corners are farther from the cener of the object, this means higher energy (from gravity) and they'll eventually round out (move to lower energy) as time passes.

Answer 2

Yes, Planets seem to be spheres, not cubes or cylinders or oddball rocky shapes. Some smaller bodies such as asteroids or Mars moons Phobos and Deimos, do have odd shapes, but larger bodies like the nine planets and most of their moons do look like spheres. That's because of the nature of gravity. You can think of gravity as a force that points inward toward the center of the planet so that every part of the surface is pulled evenly toward the center, resulting in a spherical shape.
Of course, planets are not perfect spheres because mountains and valleys and even skyscrapers are all deviations from the spherical shape. However, as planets get larger, gravity gets stronger, until eventually large objects on the surface are crushed under their own weight. That's why we don't have mountains that are 50 miles high or skyscrapers that are 2,000 stories tall. Planets stay basically spherical because any large deviations get crushed.

Although gravity keeps planets close to spherical, there are other forces that cause deviations from the basic spherical shape. For example, the rotation of the earth once every 24 hours, causes an apparent centrifugal force which creates a bulge at the equator. In fact the earth's diameter at the equator is 7,926 miles while the diameter between the poles is only 7,900.

But stars are not round they to look round, but they are in different shapes.

Answer 3

I assume you are asking why objects like earth/ moon etc round ( rotate ) around objects like Star, is that right? if that is not right then others have already answered your question.

if what i assumed about your question is right then;

it is simple physics. in this universe there is always a hierarchy system. With gravity, force etc it is always bigger object remains in the center forces other smaller objects to rotate around.

Obviously stars are most of the time bigger than planets and satellites. at least i doubt we know of any planet bigger than a star so far.

So planets have to rotate around the stars near them. no option there.

Whenever a planet system gets created first there will be a big star which gives rise to planets ( which are nothing but chunks of star where fire stops for some reason ). It almost always happens that the parent-star remains still bigger after giving birth to planets so obviously they will rotate around the parent star.

It would be interesting to find out what would happen if when the star breaks into pieces if all the pieces convert into planets and no star material is left behind; first of all does it happen?; if so how often? ; if so will there be a planetary system where a big planet like Jupiter is in the center and rest of the smaller planets rotate around it???

If such planetary system exist then it is almost bleak chance that intelligent life like human beings can originate in those planets if we consider that intelligent life requires many more ingredients including light, flowing water ( not ice ) etc etc.

Well we don’t know;

Answer 4

Everything in space is not round. For something to become round in space, it has to have enough mass to pull all the sides inward, so a sphere results. Many asteroids are not round. one of the ones that will threaten Earth in a couple hundred years is shaped like a potato.

Answer 5

If you think about it...which way does the earth's gravity pull? Toward the center from every direction right? A sphere is the only shape in which all points along the edge are the same distance from the center.

Answer 6

Gravity causes matter to collect. When enough matters collects in one spot, the gravitational force from other objects acts on it causing rotation, orbits, etc. The centrifugal force from the rotation, causes the spherical shape while gravity holds the object together. The higher rotational speed at the object's "equator" results in an elliptical shape rather than a true sphere.

Answer 7

Einstein, in his general theory of relativity, said that gravity is the curvature of space-time. The CENTER of any large body in space would be the deepest, and the strongest point of gravity... so the object's mass is actually trying to fall in on itself. A sphere is the shape where all pars of an object are as close to the middle as possible.

Gen. Relativity wiki:
http://en.wikipedia.org/wiki/General_relativity

Answer 8

because gravity pulls everything to a center point (or trys to)so that when a space fills um it will just pillup and a square or triangle has points that a further away then a sphere which is constently full if you know what i mean

Answer 9

It's because of gravitational pull which "tugs" on the center point of the heavenly body, therefore evenly spreading all of the land into a sphere.

Answer 10

Gravity makes it that way...? Go check your history book, laddie!