P. van der Werf

Light from a distant galaxy, bent by a foreground cluster, creates four identical images in the sky. Ordinary matter alone wasn’t enough for such a trick—only by adding invisible dark matter did scientists achieve a match with observations. Now this cross serves as a natural telescope into the unive

Centaurus A is the nearest radio galaxy to us, where an active supermassive black hole lives at its center, shooting out a powerful jet, while a warped dusty disk whirls around it. For a long time, it remained a mystery whether stars could be born under such extreme conditions. New observations with