Since the forces are the same in magnitude, and both the earth and the apple have a mass, the earth is accelerating towards the apple just like the apple is accelerating towards the earth but only with a lesser value. It is hard to imagine that the earth is moving towards the apple just like the apple is moving towards the earth. From Newton's second law it is proven that mass and acceleration are inversely proportional to each other, so as the mass of the object gets bigger, the rate at which it moves will be smaller. The velocities of planets in space on the other hand can be seen and are not to be considered negligible. Planets can bee seen revolving around the sun, but that is not the only thing they can revolve around.
Planets can also revolve around each other, for they are both merely objects that have a mass.
From what was mentioned earlier, it would appear that planets would end up crashing into each other, or into the sun. This sometimes does happen though, as meteors have been known to come in contact with the earth's surface. The earth, on the other hand has been around for a long time, and has never gone crashing into the sun. This is because the earth is actually moving in a different direction than straight at the sun. The same can be said with the moon s motion around the earth.