“Moons of Moons” –Could Serve as an Outpost for a Technological Civilization

Moon of Jupiter

 

“An artificial submoon may be stable and thereby serve as a time capsule or outpost for a technological civilization. On a stable orbit around the Moon–such as the one for NASA’s proposed Lunar Gateway–a submoon would keep humanity’s treasures safe for posterity long after Earth became unsuitable for life.”

(more…)