SA Space & Physics

Two years on, the search for our solar system’s missing world is as frenzied as ever—and the putative planet is running out of places to hide

The newfound object NGC 1052-DF2 defies easy explanation and could lead to breakthroughs in our understanding of how galaxies form and evolve

Anticipated but never before seen, the existence of tens of thousands of these dark objects at the galactic center could have far-reaching implications for astrophysics

After a clutch of historic detections, gravitational-wave researchers have set their sights on some ambitious scientific quarry