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

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

Scientists are testing a novel way to measure cosmic expansion using time delays in gravitationally lensed quasars. Their results match “local” measurements but clash with early-universe estimates, ...

Scientists have released nine dazzling images from NASA's Chandra X-ray Observatory, blending data with the Hubble and James Webb space telescopes to reveal black holes, star clusters and distant ...