Not an expert but if the earth is in the orbit it has now, it's because that's indeed the most "stable" orbit it can assume. Even if the earth got pulverized,

Not an expert but if the earth is in the orbit it has now, it's because that's indeed the most "stable" orbit it can assume. Even if the earth got pulverized, the remnants would be floating as a cloud around the sun, in the shape of its orbit. The Earth's orbit is a influenced not only by the sun's gravity, but by that of every component of the solar system (to varying degrees, of course). Also, I'm sure the orbit we have now is not the same as the one pre-collision.