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Planets stay on their path because there is balance between the gravitational and forces and the velocity of these planets.

First: imagine what happens when you drop something: it will fall down. If you drop it from a skyscraper, it will fall down, but the fall takes time.

Second: imagine a canonball: if you shoot it, it will fall down in the end. But at first, because it has a lot of velocity, the 'force' of the velocity is almost as strong as the gravitational force. When the ball slows down, it will fall down.

Third: each planet has its own gravitational force. If you drop something on the moon, it will fall down, but the 'power' of the moon is smaller than the 'power' of the earth.

Ok, remember these.

Now imagine two planets. If they wouldn't move, like the canonball, both would have a certain gravitational force. They would attract each other and in the end they would collide somewhere in the middle (where exactly depends on the difference between the two forces). So if each planet didn't have a path, they would fall down into the sun, because the sun has the biggest gravitational force. It would take some time (think about dropping something from a skyscraper), but all would fall down.

Now think of a planet in orbit around the sun: if there was just one sun and one planet, if there was nothing to slow the planet down and the velocity was just high enough to compensate for the gravitational force of the sun, it would orbit around the sun for ever (think about the canonball: it falls down when it slows down). It can't escape: the orbit is circular because every moment the planet 'tries to fall down' into the sun and every moment the fall is compensated by it's speed, so it keeps an exact distance from the sun.

Ok, now think of multiple planets and multiple suns. Every planet is exactly balanced between the gravitational forces of the other planets around it, the 'force' of the sun and the 'force' of it's own velocity. If one of these powers changes, there are three options: 1. the speed is stronger than the gravitational force. In this case, the planet escapes from the suns gravity and flies away. 2. there is a stronger planet in the distance: the planet will fall down to that planet (think about the moon, orbitting around the earth and with the earth around the sun) or 3. the planet has slown down so much that the gravitational force of the sun is the most powerfull. Now it will drop into the sun.

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14y ago

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