Scientists are testing a novel way to measure cosmic expansion using time delays in gravitationally lensed quasars. Their ...

There is an important and unresolved tension in cosmology regarding the rate at which the universe is expanding, and ...

Astronomers are increasingly finding planets that do not simply circle their stars in neat, clockwork ellipses but instead trace out paths that look more like intricate choreography. The latest ...

In the leading model of cosmology, most of the universe is invisible: a combined 95% is made of dark matter and dark energy.

The most distant known star in the universe is no longer a faint, anonymous point of light. With the James Webb Space ...

A network of powerful ground-based telescopes captured rare starspot-crossing events on TOI-3884b, revealing cooler patches ...

Determining the "loudest recorded sound" depends on how you define sound and on which measurements you choose to include.

The interstellar comet 3I/ATLAS is making its final pass, highly active after its Sun encounter. NASA and ESA release new ...

With major eclipses, brilliant supermoons, and lineups of five or more planets, 2026 offers something awe-inspiring in every season. Here’s what to watch for.

Drawing on the University of Arizona’s renowned strength in interferometry, astronomers from Steward Observatory are leading ...