> It's a bit like an alien scientist showing an X-ray picture of a skeleton:"This is a human!" What is the problem here? Surely skeleton (or other things detec

> It's a bit like an alien scientist showing an X-ray picture of a skeleton:"This is a human!" What is the problem here? Surely skeleton (or other things detectable via X-rays) is an integral part of a human. If you have no way of seeing an alien, but have an x-ray of them, wouldn't you say we have a significantly better understanding of this alien species, than having nothing at all?