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

Drawing together leading experts from across the field, an international collaboration of cosmologists has created a unified approach for measuring the value of the Hubble constant. Published in ...

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 ...

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. Using new data from the ...

Cosmology is puzzled as to why two methods for measuring the expansion of the cosmos yield different results. A third method ...

That the universe is expanding has been known for almost a hundred years now, but how fast? The exact rate of that expansion ...