2006-11-12 11:35:10 · 8 answers · asked by Anonymous in Science & Mathematics ➔ Astronomy & Space
Actually, those circles are NOT perfect. They're slighly elliptical. This is called the excentricity of the orbit.
But, yeah, they are more or less on circles, and that's because they want to go straight forward (inertia) but the pull of the Sun's gravity stops them from goind away.
It like tieing a ball on a rope and turning it around. It makes a circle. Let go of the rope, and it will go on a straigt line. The rope is the Sun's gravity.
2006-11-12 11:39:59 · answer #1 · answered by kihela 3 · 2⤊ 0⤋
The are round becuase when they formed they were molten and the gravity pulled them into a sphere because in a sphere all points are the same distance from the gravitaional core, but since they are spinning they are not perfect circles, because centrifigal force pulled them into an elipctical shape
2006-11-12 11:56:53 · answer #2 · answered by hypernova4218 1 · 0⤊ 0⤋
They are not a perfect circle as when they rotate they expand slightly at their equator.
2006-11-13 05:12:01 · answer #3 · answered by Anonymous · 0⤊ 0⤋
The earth and moon are oblong because they spin
2006-11-12 11:40:00 · answer #4 · answered by Anonymous · 0⤊ 0⤋
This is how the LAW of gravity assembles pieces...from all directions.
2006-11-12 12:40:35 · answer #5 · answered by spir_i_tual 6 · 0⤊ 0⤋
Actually..they're spheres...and none of them are perfectly round. Neither are their orbits....they're more elliptical or "off-round".
2006-11-12 11:44:30 · answer #6 · answered by Anonymous · 1⤊ 0⤋
They aren't. You really need to check your facts.
2006-11-12 11:37:13 · answer #7 · answered by marklemoore 6 · 2⤊ 1⤋
i dont think they are
2006-11-12 12:32:21 · answer #8 · answered by p3mk13 1 · 0⤊ 0⤋