Astrobiologists predict that alien moons may prove to be hotspots for life in the Milky Way. Rogue moons, dubbed “ploonets”, could explain several puzzling phenomena, not the least of which is why astronomers have so far confirmed the existence of at least 4098 exoplanets, but not a single alien moon.
“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.”
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Is Dark Matter Only the Tip of an Invisible Universe of Unknown Forces?
Have Astronomers Detected a Cosmic String from the Dawn of the Universe?
“Their Source a Mystery” -The Wild and Scenic Rivers of Ancient Mars
Strange Black Holes of the Infant Universe
Higgs Boson Portal to the Dark Sector of the Universe –“A Breathtaking World”
The Search for Axions – Detection Will Have Profound Implications
Will We Image Planet Nine Within the Next Decade? 
NASA Scientists: On What the Perseverance Mars’ Rocks Return Samples Could Tell Us