Some Belters also have elongated bones due to the low gravity conditions.
What's the science behind this? If you're raised in zero g will you end up looking like someone went crazy with the distortion tool in photoshop? The answer isn't as clear cut as you might think.
First, to be clear, this is not a case of evolution. We won't get into the discussion of competition for resources, selection, and time span issues, you'll just need to trust us on this one.
Some of our spinal growth after birth is due to gravity. However, bed-ridden children still grow to reasonably normal heights, so there are clearly many other factors wedged against each other to support spinal growth.