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Everything so far operates within the universe. Now we encounter something acting on the universe itself. In the late 1990s, astronomers made a stunning discovery — the universe’s expansion isn’t slowing down. It’s accelerating. Something invisible is pushing galaxies apart faster with every passin…

Everything so far operates within the universe. Now we encounter something acting on the universe itself. In the late 1990s, astronomers made a stunning discovery — the universe’s expansion isn’t slowing down. It’s accelerating. Something invisible is pushing galaxies apart faster with every passing moment. Scientists call it dark energy, and it makes up roughly 70% of all cosmic energy content. Everything visible — every star, planet, and person — accounts for less than 5%. Dark energy appears