By the late 21st century, humanity will have mastered interplanetary travel, setting its sights on the asteroid belt—a treasure trove of metals and resources. Advanced spacecraft, powered by nuclear fusion or next-generation,A New Study Suggests How we Could Find Advanced Civilizations that Ran Out of Fusion Fuel - Universe Today,100億年前に天の川銀河と衝突した銀河「ガイア・エンケラドス」 - アストロアーツ,New Method of Nuclear Fusion Could Reveal Alien Worlds,土星の衛星エンケラドゥスに「巨大な間欠泉」? ウェッブ望遠鏡が観測 | Gadget Gate