translation.en: But let's suppose some aliens had been watching our pale blue dot in the cosmos from afar, not just for 40 years, but for the entire 4.5 billion-year history of our Earth.
translation.zh: 让我们假想某些外星生物一直在观察着我们的暗蓝小点， 它们在遥远的某处，不只观察了四十年， 而是历经地球发展史的整个45亿年。