Spacefaring Aliens Could Use Black Holes To Travel Across The Universe
An advanced a̳l̳i̳e̳n̳ c̳i̳v̳i̳l̳i̳z̳a̳t̳i̳o̳n̳ could exploit black holes and use them as galactic waypoints that would allow them to travel...
Spacefaring Aliens Could Use Black Holes To Travel Across The Universe
