Expansion of the Universe

I've been following the "Where did the matter and energy come from?" thread. And it touched on the expansion of the universe.My understanding of this is that things aren't actually moving away from each other but space is actually expanding. We know this because objects that are farther away are moving away from each other faster than closer objects.The analogy that made me see this the best was putting two sets of marks on an elastic band. Two close together and two further apart. As you stretch the elastic the change in the position of the closer holes is much less than the change in the farther holes.Do I understand this correctly and does this mean that objects like planets are expanding dimensionally? I'm sure that the size of material objects, even stars, is so small that it would be impossible to measure but over billions of years would there be a mearurable expansion in something the size of a planet?

Thread copied to the Expansion of the Universe thread in the Big Bang and Cosmology forum, this copy of the thread has been closed.