Astrophysicists propose a new “stochastic siren” method using the gravitational-wave background from black hole mergers to ...

For years, cosmologists have argued over a simple question with an awkward answer: How fast is the universe expanding right ...

Astrophysicists from the University of Illinois and the University of Chicago have developed an innovative method to measure ...

We have known for several decades that the universe is expanding. Scientists use multiple techniques to measure the present-day expansion rate of the universe, known as the Hubble constant. These ...

The Universe is continually expanding, and scientists measure its expansion rate, the Hubble Constant, using two main methods: electromagnetic methods (using light from stars, galaxies, or supernovae) ...