Astronomers are rethinking one of cosmology’s biggest mysteries: dark energy. New findings show that evolving dark energy models, tied to ultra-light axion particles, may better fit the universe’s ...

Einstein once called the cosmological constant his “greatest blunder,” but modern discoveries of the universe’s accelerating expansion reveal it as a key insight, now linked to dark energy shaping the ...

Dark energy—the term used to describe whatever is causing the universe to expand at an increasing rate—is one of the universe’s greatest mysteries. The widely accepted theory at the present moment ...