Astrophysicists are trying to tackle discrepancies in one of the most fundamental and controversial numbers in physics — the one that tells us how fast the universe is expanding.

To estimate the Hubble constant with greater accuracy and consistency, a group of astronomers turned to the light from a unique class of quasars.

The fate of the universe rests on the Hubble constant, so why can't we figure out its value? In this episode of our podcast, assistant professor of physics Marcelle Soares-Santos explains why the ...

In 2016, astronomers using Hubble discovered that the Universe is expanding between five and nine percent faster than previously calculated by refining the measurement of the Hubble constant and ...

Historically, however, it has proven much, much harder to measure the distance to an object—the other data point needed to calculate the Hubble constant.

Gravitational waves may end up supporting one value for the Hubble constant over the other, but they may also determine a new third value for the Hubble constant, Feeney said.

Hubble’s measurements of today’s expansion rate do not match the rate that was expected based on how the Universe appeared shortly after the Big Bang over 13 billion years ago. […] ...