Galaxies

The successful unfurling of the five-layered, tennis court-sized assemblage is a major milestone for the new observatory

A growing number of galaxies seem to be bereft of the mysterious substance, posing fresh challenges for some of cosmology’s most cherished theories

The Imaging X-ray Polarimetry Explorer will probe the physics behind black holes, neutron stars and other dynamic cosmic objects

Twenty years after their initial detection, enigmatic blasts from the sky are starting to deliver tentative answers, as well as plenty of science

A major report outlining the highest priorities and recommendations for U.S. astronomy has finally been released, revealing the shape of things to come

The observatory must complete about 50 major deployments after liftoff

China’s Five-Hundred-Meter Aperture Spherical Radio Telescope has detected more than 1,600 fast radio bursts from a single enigmatic system

A chance celestial alignment is allowing astronomers to witness a distant star’s explosive death, again and again

Two controversial new studies suggest the discovery of large objects at the outer reaches of the solar system

A new breed of giants raises questions about how the biggest galaxies arise

Newly discovered lobes stretch tens of thousands of light-years above and below the Milky Way's disk. Where did they come from?