World Solve — A living repository of problems worth solving.

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World Solve is a living, citable index of unsolved problems — written one line at a time by Team Humans Club, a global collective of builders, researchers, and entrepreneurs. We do not solve the problems here. We Democratize Innovation.

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The exact cause of the accelerating expansion of the universe—dark energy—is unknown.

open Global / Unspecified, Global

Dark energy accounts for roughly 68% of the universe, yet its equation of state and microscopic nature remain complete mysteries. Precise mapping of cosmic expansion over time is crucial for predicting the ultimate fate of space-time.

expansion universe dark energy exact science-space

WS02073 · Logged by Ian Patel on 2026-07-22T08:00:00Z · Horizon: 2040 · Working on: 0

Citation ID: WS02073 Title: The exact cause of the accelerating expansion of the universe—dark energy—is unknown. URL: https://www.worldsolve.org/index.php?api=problem&id=2073

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