It is a spaceship! Interestingly enough, we were told back in late November the following by Angelus Domini:
Yes, it is an interstellar spaceship.
'Stone ships' are very popular among certain spacefaring races, because it is easier to carve a ship out of an asteroid that meets proper specifications, than it is to fabricate construction materials, and manufacture a ship on a planet (in whole or parts), and then launch it into space, and hope there are no structural fractures that could cause it to decompress... The asteroid, by comparison, is an already 'tested' object that is strong enough to withstand space travel, and requires little if any navigational shielding, because the hull is so thick, so it is a safer build in many ways.
The same engineering principle is why you see many ancient apartment complexes and temples carved into the sides of mountains...These were carved using the same technology utilized by the stone ship builders.
Some of the older stone ships have been damaged over time, and if the damage was extensive enough to where it could not be repaired while underway, for example, if the engines and guidance system were completely broken, the ship would continue on its course, because the crew would not have the ability to slow it or change its direction, so they would abandon the ship, and have a rescue ship pick them up, while the damaged stone ship simply continued on its path forever, or until it crashed into something.
More often than not, the attraction of a sun will pull these abandoned ships into a safe orbit, that will eventually lead to it diving into the sun without incident.
Wow that's a really fascinating idea to make a ship out of an asteroid, they've been 'tested'that's for sure.