Why do earth and other planets move round the sun, even though the gravitional force acts toward sun?
337086
The planets are actually trying to move in a straight line at a high speed due to the intertia from some force long ago.  When two objects are moving by each other, their gravity interacts and pulls them toward each other, bending the path that would otherwise be a straight line.  If they are too massive and too close, the gravity pulls them so much that they collide.  If things are balanced just right, the path is bent into a complete ellipse.  It's an ellipse instead of a circle because the sun is actually also being pulled a tiny bit toward the earth, as well.\n\nYou could consider gravity to be sort of a "perpendicular inertia", and the planets would revolve around the sun FOREVER if there were no other forces involved.
48080
coz it is move together with other planets in constant maner around the sun
1000295
Yes the sun moves but let me explain:\n\nThe sun rotates just like earth does only at different speeds. Without going into tedious explanation this is what ultimately causes sun spots and solar flares.\n\nThe Sun also has a slight wobble to it. It doesn't really orbit but due to the gravitational pull of the planets on the sun the sun has a VERY small wobble. Basically in physics you have to add the collective mass of the sun and the planets when calculating the exact center mass of the solar system. When you do this the exact center does not fall at the exact center of the sun; it's slightly off.\n\ngo to this websites to see it in a diagram:\n\nhttp://tycho.bgsu.edu/~laird/cp_images/wobble.html
302598
An interesting question. The question that may comes to \neveryone's mind is "IS the earth round?"  \nAnd the answer is no, at least \nnot perfectly round.  But it is round compared to your average cube, that is \nfor sure!  Now, my understanding of how solar systems form is pretty \ninadequate; all I can tell you is what I see on "Nova."  But basically, I \nguess it has to do with gravity, which is a CENTRAL FORCE.  What that means is \nthat gravity pulls things together along a straight line, and the more massive \none of the things is, the stronger it pulls.  When the earth was forming, it \nwas basically a big ball of dust left over from an exploded sun (a supernova).  \nGravity caused a lot of the matter to condense into a big fiery ball (our \nsun), but some of the dust was far enough away from the Sun so that the \nstronger forces were between planetary dust particles and not the sun.  SO, \nthey swirled together into a ball.  You can see something similar when you \nmake a painting with one of those "spin-art" machines; you put a card on the \nspinner, which whirls around real fast, and then you squirt paint on the card.  \nThe whirling causes the paint to go out away from the center (this is like the \nexplosion of the supernova) and droplets go out along an interesting path \nuntil they stop, which happens when the spinning force is equal and opposite \nto the force which attaches paint to the card (this is like gravity).  Now, if \nthe force attaching paint to the card were not so strong,eventually the drops \nwould get bigger - "planets."
582803
The moon has its own speed in space. But the earth pulls it toward it.  \n\nif any object is moveing with some speed and if a force is applied latterally (perpendicular to its direction of motion)  and pointed toward a fixed point then the body will move in circular motion\n\nSince the earth's pull is perpendicular to the motion of the moon and is always pointed toward the center of the eaarth the moon moves always round the earth.
35969
The Earth rotates (spins around).  Sometimes a side is facing the Sun and is in daytime.  Sometimes it is not and is in nighttime.
161923
Earth and all the other planets in the solar system revolve, or orbit, around the Sun due to the force of gravitation. The Earth travels at a velocity of about 107,000 km/h (about 67,000 mph) as it orbits the Sun.
1086962
Yes the earth moves round the sun as do the other planets and when the sun and the moon are aligned with the earth then we are eclipsed depending on which part on the planet you live.
285187
The are round, in short, because it takes the least enegry to do it.\n\nGravity pulls the matter that will make up the planets/sun/... together.  All the forces are pointed towards to the objects center of mass, everything is being pulled inward toward the center.  With everything trying to get as close as possible to the same center of mass, the object develops a round/sphereical shape.  This shape minimizes the amount of potential energy the matter has above the center of mass.\n\nThe reason why some objects (like the Earth for example) as not totally sphereical is because they are roating around an axis.  Since the Earth is rotating on its axis (causing our days and nights), there is a bulge around the equator as the matter located there is rotating faster [tangential speed] than the matter located at the poles.  This faster tangential speed requires more centripetal force [not to be confused with the fictional "centrifugal" force] or order to keep it rotating.  In order to lessen the required force, the matter bulges out a little bid, increasing its radius away from the axis.\nCentripetal force = m(v^2/r),\nyou can see that a larger radius (r) away from the center means a smaller centripetal force is needed.
668189
Nobody has found any evidence for a form of gravity the repels instead of attracting, but that doesn't keep people from looking for it. It may yet be found. But such a force is not needed to explain orbital motion. In fact, it would disrupt orbits, causing the Earth to fly away from the Sun and never return.
66192
It is due to the slight orbital eccentricity of Earth rotation around the Sun. Since the orbit is not perfectly circular the distance between the two bodies varies.
1069004
For the most part, the atmosphere moves along with the surface of the earth. On the other hand, winds going in any direction tend to grind down mountain peaks.\n\nHowever, if the Earth were not fairly close to round, then the molten lava inside the earth would rupture the crust and deform the earth into a round shape. The main reason the Earth is round is gravity, not wind.
1094061
Earth is revolving in orbit, held in place by the Sun's gravitational pull
566885
Not only by the sun;s gravity,coz otherwise they would rush into yhe sun.they have a certain centrifugal force of their own,which keps the 2 forces balanced,and their moton remains cinstant.the closer a planet,the higher sun;'s gravitational pull towards it,hence it has higher centrifugal force,that is,it rotates more quickly on its axis.
759329
There are 2 ways to think abut it.\n\nOne way is that the centrifugal force of the orbital motion balances the gravity of the Sun, so if the Earth is orbiting a little too slow, it falls toward the Sun. But as it falls, it speeds up which increases centrifugal force faster than the decreasing distance can increase the pull of gravity. The result is that the Earth ends up closer to the Sun but going too fast. The extra centrifugal force causes the Earth to fly away from the Sun, but as it does it slows down. And it slows faster than the rate at which gravity gets less with distance. The result is that Earth ends up farther from the Sun and going too slow, just where it started from. This repeats forever to make an elliptical orbit. The only way to get a circular orbit is for the Earth to have exactly the right speed, not even off by a millionth of a mile per hour from the right speed. That would never happen in nature, so all the orbits are more or less elliptical.\n\nThe other, more physically accurate way of looking at it is the Earth is always falling into the Sun, but the "sideways" orbital motion makes it miss the Sun to one side all the time. If it is going too slow, it doesn't quite miss the Sun enough and ends up falling a little closer. But as it falls, it speeds up. And from here on the explanation is the same as above, but it is the sideways motion allowing a continuous fall instead of a balance between gravity and centrifugal force. The reason this is more physically accurate is that centrifugal force isn't real. It is a virtual force, but that is confusing to most people not schooled in physics.
1096009
At this point, the question is not what moves the sun or the earth, but what if anything is stopping it.\n\nThey were set in motion long ago. (nobody knows precisely how and why but most of the astronomy theories have to do with motion and energies imparted in a big bang or the like)\n\nOnce in motion, an object will stay in motion until something stops it.  So, nothing is moving the earth now, it is just still moving.  It will continue rotating and orbiting and winging along through space until something interferes.
679561
Earth and all the planets in out solar system are orbiting our Sun. The Sun and all stars are moving in space, but those other stars are not moving around US; they are orbiting the center of the Milky Way galaxy. Because the stars are so far away from us it takes thousands of years before they have moved far enough for us to notice it from so far away, but astronomers have made careful measurements with telescopes and can detect small position changes, which they call "proper motion". I googled "proper motion" and below is the first result.