Why Measuring the Universe’s Speed Is Taking a Century

Swift Summary

• The article focuses on the Hubble constant, which connects a galaxy’s speed to its distance from Earth and calculates the expansion rate of the universe.
• First introduced over a century ago, determining an accurate value for this constant has been an ongoing debate among astronomers.
• The Hubble Space Telescope has played a key role in providing images of galaxies, helping refine measurements related to cosmic expansion.

Image Description:
A notable image captured by the Hubble Space Telescope featuring numerous galaxies. Credit: NASA, ESA, B. Sunnquist, J. Mack, J. Lotz (STScI), HFF Team.