A near-complete census of our interstellar neighborhood hopes to answer how stars, brown dwarfs and rogue planets form ...

Combining the way that massive galaxies and galaxy clusters bend space and magnify our view of the distant universe with ...

Dark matter affects how stars move within galaxies, how galaxies build up over time, and how everything in the universe is held together—but no existing tool has directly detected it. While dark ...

We more safely roam city streets after dark. The city of Las Vegas dumps an enormous amount of light into its environment, turning the night sky above into a seemingly blank canvas. Photograph by ...