D. Stern

The JWST peered into the hearts of gravitational lenses — and found not a single smudge expected from lightweight dark matter particles. New data shut down many warm dark matter models and bolster the standard cold scenario. Limits on the half-mode mass and thermal relic mass are among the tightest

At the peak of star formation, 12 billion years ago, quasar WISSH13 was ejecting two streams of matter at near-light speeds. Analysis of XMM-Newton and NuSTAR data revealed a cold corona and powerful reflection—a sure sign of accretion at the Eddington limit. These ultrafast winds, with kinetic powe