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 ...

NASA has released a huge new report that astronomers are calling Hubble’s magnum opus. Analyzing 30 years of data from the famous space telescope, the new study makes the most precise measurement yet ...

To many cosmologists, the best thing about neutron-star mergers is that these events scream into space an otherwise close-kept secret of the universe. Scientists combined the gravitational and ...

The Hubble Space Telescope might be best known by the public for the beautiful images of space it captures, but it is most famous among astronomers for producing groundbreaking insights into the ...

This illustration shows the three basic steps astronomers use to calculate how fast the universe expands over time, a value called the Hubble constant. All the steps involve building a strong "cosmic ...

Some astronomers think one set of measurements or the other will turn out to be wrong. Others believe that the tension is a hint of deeper problems with the scientific description of the universe, ...

A cosmic camera hog is helping astronomers figure out the rate of the universe’s expansion. Images of the supernova Refsdal have popped up multiple times in the constellation Leo, thanks to light from ...

A 60-year-old prediction just helped astronomers measure the expansion of the universe. Astronomers recently used the light of a distant supernova to calculate how fast the universe is expanding. But ...

Combined Webb and Hubble Space Telescope data showing the galaxy NGC 5584, 72 million light-years away. Image: Image NASA, ESA, CSA, Adam G. Riess (JHU, STScI) Image Processing Alyssa Pagan (STScI) ...

A meandering trek taken by light from a remote supernova in the constellation Cetus may help researchers pin down how fast the universe expands — in another couple of decades. About 10 billion years ...