One of the most stubborn issues in cosmology today concerns the universe's rate of expansion. Scientists know it's expanding, ...

By studying how light from eight distant quasars is gravitationally lensed as it propagates towards Earth, astronomers have ...

New research suggests that a troubling disparity in the rate of expansion of the universe, known as the Hubble constant, may arise from the fact Earth sits in a vast underdense region of the cosmos.

Whatever dark energy is, explanations for it have less wiggle room following a Hubble Space Telescope observation that has refined the measurement of the universe’s ...

We have known for almost a century that the universe is expanding, but it's been surprisingly hard to nail down the rate of expansion. The availability of the James Webb Space Telescope is finally ...

Learn how Hubble is measuring the expansion rate of the Universe in this new explainer from NASA's Goddard Space Flight ...

Ever since the early 20 th century, we’ve known that the universe is expanding. Exactly how quickly it’s expanding, however, remains something of a vexed question. Until now, our theoretical ...

IT IS ONE of the biggest mysteries in cosmology—and getting bigger all the time. Ever since Edwin Hubble, an American astronomer, published observations of distant galaxies in 1929, scientists have ...

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 ...

Different parts of the universe could have different rates of expansion, potentially explaining the perpelexing "Hubble tension." When you purchase through links on our site, we may earn an affiliate ...

The James Webb Space Telescope has captured some bizarre imagery of an exploding star that, for some reason, kept repeating itself. In a press release, NASA said that new Webb images of what ...

The original version of this story appeared in Quanta Magazine. Nearly a century ago, Edwin Hubble discovered that the universe is getting larger. Modern measurements of how fast it is expanding ...