Einstein’s “Biggest Blunder” Was Actually Right | NOVA | PBS
Why It Matters
The realization that cosmic expansion is accelerating reshaped fundamental physics and cosmology, introducing dark energy as a major unknown that determines the universe’s fate and challenges theoretical understanding. Resolving its nature has profound implications for particle physics, gravity, and the long-term evolution of the cosmos.
Summary
Einstein introduced the cosmological constant to force a static universe, but Hubble’s 1920s observations showed the cosmos is expanding and the discovery of the cosmic microwave background later confirmed a hot Big Bang origin. In the 1990s, Adam Riess and other teams used Type Ia supernovae as standard candles and unexpectedly found the expansion is accelerating, effectively reviving Einstein’s cosmological constant as a real physical effect. That accelerated expansion is attributed to dark energy — a mysterious repulsive component of the universe that dominates its dynamics. The film traces this arc from historical ideas to modern observational evidence that transformed cosmology.
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