IIRC, it was scientist and author Arthur C. Clark whom may have be the first to seriously propose that if our Solar System had ever been visited by "Others" in the past, evidence of such might be on the Moon(Luna) or other moons in the Solar System.
The following link connects so a series of six such lengthy articles and the images are the result of a "robot" probe we sent to Saturn years ago. Supposedly these images of Iapetus weren't on the original agenda, but with Iapetus orbiting much further out than the rest of the moons of Saturn, it afforded the the chance to do gravitational sling to reposition orbit of Cassini.
For more than a decade, NASA’s Cassini spacecraft shared the wonders of Saturn, its spectacular rings, and its family of icy moons.
solarsystem.nasa.gov
While Cassini provided several interesting photo images of Iapetus, seems it's ground penetrating radar was not used on this flyby, so no details below the surface were obtained. Pity!
Among some of the interesting surprises are the @ 12 mile wide and @12 mile high "mountain" ridge which runs along the "equator" of this moon/planetoid, possible full circumference. Also, the closeup image suggesting it is actually three parallel ridge lines.
Another interesting find was the numerous "craters' which have rather geometric shapes, many being hexagonal in form. Also, what looked to be rectilinear features/structures on parts of the surface.
While the author of the articles, Hoagland, initially speculated this might be a derelict from earlier higher tech Terrestrial culture/civilization; other have wondered if it might have been an inter-stellar colonization ship.
Along with ideas put forth by Futurists that we might hollow out habitat areas beneath the surface of asteroids, perhaps even boost such into closer orbit near Earth; another concept would be use this process to create and inter-stellar exploration/colony ship. One isn't boosting stuff up through Earth's gravity well - the right asteroid would have numerous types of minerals and metals for raw materials - hollowed out chambers beneath the surface could provide habitat areas for the human crew/colonists - enough radio-actives for fuel and energy - this could be a colony/generations ship that could make a slow, sub-light (subluminal) journey to the nearest star.
Would take decades to generations to get there, but is one way.
Might some one else have done so coming to here in the distant past ?
Moon with a View
Or, What Did Arthur Know … and When Did He Know it?
Part 1
Note, links to each of next article in the series at the bottom of the page of the article.
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