[split] Relying on external imagery

[-JKP-]

Even if they turn out to be made up (which I think is possible but it would be unusual), it's still important to investigate whether they are real star maps so the possibility can be eliminated on the basis of empirical evidence, rather than on assumptions.

It's also possible that they represent something (that they are not made up), but that it is "something" less obvious than star maps.