An Unexpected Twist in the Universe's Expansion

In the early 1990s, it was widely believed that gravity would eventually slow the Universe's expansion, possibly leading to a future collapse. However, in 1998, observations of distant supernovae revealed that the Universe was actually expanding faster over time, defying expectations. This unexpected acceleration suggested that something was counteracting gravity's pull, a phenomenon later termed "dark energy." Theorists proposed various explanations, including a revisited cosmological constant from Einstein's theory of gravity, a mysterious energy-fluid filling space, or a flaw in Einstein's theory itself, but the true cause remains unknown.
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