Yeah, Pied Piper, I do regard that as fairly unlikely...but not impossible. Space operations would require any air-breathing creature to wear a close-fitting helmet at times, with a transparent visor. It is possible that the hominid body structure is a more universal form among intelligent creatures in the galaxy than is presently suspected by Earth scientists. It is also possible that those pictographs do not represent astronauts or vehicles at all, but represent something else entirely. I remain curious about them, but draw no absolute conclusions from them.

There is even another possibility...that mystics were able to see visions of future events...and draw pictures of those events. Thus a person 3,000 years ago might have had a vision of 20th century and 21st century helicopters, astronauts, etc...and then drawn a picture of his vision. That, of course, has nothing to do one way or another with visiting aliens in spaceships.

- LH