SMRTR Science & EngineeringJul 23, 2026Quanta Magazine

How Fast Is the Universe Really Expanding?

SMRTR summary

The universe's expansion rate remains one of cosmology's biggest unsolved puzzles. Since the 1990s, scientists have known the expansion is accelerating — not slowing — and dark energy was proposed as the driving force, but measuring exactly how fast remains deeply contested among astronomers today.

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