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cosmic expansion

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Hubble’s Law of Expansion
Space, Astronomy and Cosmology

Hubble's Law: The Equation Behind Cosmic Expansion

Hubble's law is the observation that distant galaxies move away from Earth at speeds proportional to their distance.

supernova distance measurement bias
CosmologyScience Explorer

The Cosmic Expansion May Not Be Accelerating After All

A controversial finding by Korean cosmologists suggests that the expansion of the universe may be slowing down.

Image showing galaxies and supernovae.
CosmologyScience Tracker

Dark Energy Survey: Dark Energy may be a Constant of Nature

The Dark Energy Survey's final supernova results offer the most precise measurements yet of the universe's expansion rate, suggesting that dark energy might...