2006-08-24 04:35:39 · 11 answers · asked by ash_win 1 in Science & Mathematics ➔ Earth Sciences & Geology
because a sphere (they are not circles, they are 3-D objects) is a shape that takes the least amount of energy to maintain.
That's why large objects that exist in a vaccuum (such as space) maintain the shape of a sphere. They would need other forces acting on them in order to retain the shape of a pyramid or other simple multi-sided shape.
In actually, some moons are slightly elliptical due to the forces of gravity that effect them from larger objects near them. I believe even earth may be slightly elliptical, but i don't remember for sure.
2006-08-24 04:43:25 · answer #1 · answered by Anonymous · 0⤊ 0⤋
It is due to the heat energy contained within them. Heat energy forming mass into a sphere is also done in the manufacture of "shot" for a shotgun. Molten metal is dropped through a screen into water below. On the journey downward to the water the molten forms into a sphere.
The equation for this is found in c2 = E/m. It shows that the force forming mass into a sphere is that of a mass-energy product. This is defined as a field of physical time, or a gravitational field.
2006-08-24 07:48:00 · answer #2 · answered by Anonymous · 0⤊ 0⤋
When an astronomical body reaches a certain size its mass has to obtain the most favorable shape of its constituent parts. That shape is a sphere, or more correctly, an ellipsoid.
2006-08-24 09:44:05 · answer #3 · answered by Amphibolite 7 · 0⤊ 0⤋
They are in elipses. For it to travel in a triangle shape, the sudden accelleration at the corner would be impossible and would need some external force.
oops I thought you were refering to the orbit
2006-08-24 04:39:33 · answer #4 · answered by JimZ 7 · 1⤊ 0⤋
even other objects traverse in space like meteors,which have no round but irregular shapes.even earth and other planets are not fully circular,but they are oblong ie lightly chipped off at the poles
2006-08-24 04:44:31 · answer #5 · answered by toliagoldstar 2 · 0⤊ 0⤋
the gravity of any significantly sized celestrial object pulls all of its matter as close as possible to the center of gravity, thus a large lump of rock in space eventually becomes at least roughly spherical
2006-08-24 04:49:05 · answer #6 · answered by prof_einstein 2 · 1⤊ 0⤋
Because they were made that way! They can only exist the way they are if they are ellipsoids. They can only rotate on one axis. You'll notice that no celestial bodies spin or rotate on two or more axis.
2006-08-24 04:45:41 · answer #7 · answered by tw_timberjon 1 · 0⤊ 0⤋
what do you mean?? you've never heard of trapazoidia 3, of the outer rectangularius system ?? boy, get a clue. -- sorry, I couldn't resist. they all are spinning, fast! against gravitational fields, etc. I'm tired-going to bed. hope you're closer now, kid. -- rat
2006-08-27 16:07:57 · answer #8 · answered by Raptor 3 · 0⤊ 0⤋
gravity..actully they are spheres which are sometimes distorted by the rotational forces present.
2006-08-24 05:06:17 · answer #9 · answered by frank 5 · 0⤊ 0⤋
bcz round ie, zero is the most important
2006-08-24 16:48:14 · answer #10 · answered by corrona 3 · 0⤊ 0⤋