Aliens visiting Earth might sound exciting—but the math is brutal. According to a StudyFinds report via The Conversation, an aerospace engineer breaks down the engineering reality: interstellar travel from even the nearest star system is about 4.25 light-years away, making trips extremely long and energy-intensive. Even at a theoretical 10% of light speed, the journey would take around a century.
Chemical rockets would require impossible fuel masses, antimatter is too scarce, and fusion would still demand ships heavier than their fuel loads. Add to that deadly cosmic dust impacts, radiation shielding, and competing design constraints, and the mission becomes almost physically infeasible. The article concludes no physical law forbids interstellar travel, but engineering constraints make alien visits unlikely in practice.
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