Ripples in Spacetime and the Universe’s Most Controversial Number

The Hubble Deep Field. Each smudge of light a galaxy containing billions of stars. Measuring how fast the universe is expanding has become one of astronomy's greatest unsolved arguments (Credit : NASA/ESA/STSci)

Douglas Adams famously told us the answer to life, the universe and everything is 42. Astronomers have been wrestling with their own version of that answer for years, except their number is the Hubble constant, a measure of how fast the universe is expanding, and nobody can agree what it is. Now a new study using ripples in spacetime as a measuring tools has produced a fresh value that might just help resolve one of the biggest arguments in modern cosmology.

Universe Today
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