Florian Kühnel

The James Webb Space Telescope spotted galaxy Abell 2744-QSO1, which has almost no heavy elements (astronomers call them metals), and its central black hole weighs hundreds of times more than all its stars combined. Standard scenarios can't explain this imbalance.

For a whole year, LIGO, Virgo, and KAGRA listened to the trembling of spacetime. Thousands of mergers of black holes and neutron stars left clear signatures. But hidden among them was another signal — a barely audible whisper.